diff --git a/core/TESTS/tests.py b/core/TESTS/tests.py
index 946d579..aed66bb 100644
--- a/core/TESTS/tests.py
+++ b/core/TESTS/tests.py
@@ -158,6 +158,16 @@ class PageTests(TestCase):
         phmatch    = re.search(ph, content)
         self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
 
+    def test_page_ss(self):
+        response = self.client.get('/survey_scans/')
+        self.assertEqual(response.status_code, 200)  
+        
+        ph = r'All Survey scans folders '
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        with open('ss-op.html', 'w') as f: 
+            f.write(content) 
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'") 
 
 
     def test_page_admin(self):
diff --git a/core/TESTS/tests_caves.py b/core/TESTS/tests_caves.py
index 2e05ce9..841691c 100644
--- a/core/TESTS/tests_caves.py
+++ b/core/TESTS/tests_caves.py
@@ -4,36 +4,137 @@ Modified for Expo April 2021.
 
 import unittest
 import re
-from django.test import TestCase, SimpleTestCase, TransactionTestCase, Client
-from troggle.core.models.caves import Cave
+from django.test import TestCase, SimpleTestCase, Client
+from troggle.core.models.troggle import Expedition, Person, PersonExpedition
+from troggle.core.models.caves import Cave, Area
 
-        
-class FixturePageTests(TestCase):
-    # The fixtures have a password hash which is compatible with plain-text password 'secretword'
-    fixtures = ['auth_users', 'expo_areas', 'expo_caves']
+class FixtureTests(TestCase):
+    '''These just hit the database.
+    They do not exercise the GET and url functions
+    '''
+    fixtures = ['auth_users', 'expo_areas', 'expo_caves', 'expo_exped']
     ph = r'and leads in 800m of tortuous going to'
 
     def setUp(self):
-        from django.contrib.auth.models import User
-        self.user = User.objects.get(username='expotest')
- 
-    def tearDown(self):
         pass
 
-    def test_fix_cave_loaded(self):
+    def tearDown(self):
+        pass
+        
+    def test_fix_person_loaded(self):
+        p = Person.objects.get(fullname='Michael Sargent')
+        self.assertEqual(str(p.first_name), "Michael")
+
+    def test_fix_person_loaded(self):
+        pe = PersonExpedition.objects.get(pk='681')
+        self.assertEqual(str(pe.person.fullname), 'Michael Sargent')
+        self.assertEqual(str(pe.expedition.year), '2019')
+
+    def test_fix_area_loaded(self):
+        a = Area.objects.get(short_name='1623')
+        self.assertEqual(str(a.short_name), "1623")
+        
+    def test_fix_cave_loaded115(self):
         c = Cave.objects.get(kataster_number='115')
         self.assertEqual(str(c.description_file), "1623/115.htm")
         self.assertEqual(str(c.url), "1623/115.htm")
         self.assertEqual(str(c.filename), "1623-115.html")
         
+        # c.area is a  'ManyRelatedManager' object and not iterable
+        #self.assertEqual(str(c.[0].short_name), "1623")
+        
         ph = self.ph
         phmatch    = re.search(ph, c.underground_description)
         self.assertIsNotNone(phmatch, "In fixture-loaded cave, failed to find expected text: '" + ph +"'")
 
-    def test_fix_cave_url(self):
+    def test_fix_cave_loaded284(self):
+        c = Cave.objects.get(kataster_number='284')
+        self.assertEqual(str(c.description_file), "")
+        self.assertEqual(str(c.url), "1623/284/284.html")
+        self.assertEqual(str(c.filename), "1623-284.html")
+        
+        ph = r'at a depth of 72m, there are large round blocks'
+        phmatch    = re.search(ph, c.notes)
+        self.assertIsNotNone(phmatch, "In fixture-loaded cave, failed to find expected text: '" + ph +"'")
+
+
+class FixturePageTests(TestCase):
+    '''Currently nothing that runs troggle works - all do 404. Must be something in a template rendering crash?
+    ordinary pages are OK, and expopages and expofiles are OK, even though they come through troggle.
+    '''
+    # The fixtures have a password hash which is compatible with plain-text password 'secretword'
+    fixtures = ['auth_users', 'expo_areas', 'expo_caves', 'expo_exped']
+    ph = r'and leads in 800m of tortuous going to'
+
+    @classmethod
+    def setUpTestData(cls):
+        pass
+
+
+    def setUp(self):
+        from django.contrib.auth.models import User
+        self.user = User.objects.get(username='expotest')
+        
+         # Every test needs a client.
+        self.client = Client()
+
+    def tearDown(self):
+        pass
+
+
+    def test_fix_expedition(self):
+        response = self.client.get('/expedition/2019')
+        self.assertEqual(response.status_code, 200)  
+        
+        ph = r'Michael Sargent'
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        with open('exped-op.html', 'w') as f: 
+            f.write(content) 
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
+
+
+    def test_fix_personexped(self):
+        response = self.client.get('/personexpedition/MichaelSargent/2019')
+        self.assertEqual(response.status_code, 200)  
+        
+        ph = r'Table of all trips and surveys aligned by date'
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        with open('persexped-op.html', 'w') as f: 
+            f.write(content) 
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
+
+    def test_fix_person(self):
+        response = self.client.get('/person/MichaelSargent')
+        self.assertEqual(response.status_code, 200)  
+        
+        ph = r'second-generation expo caver '
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        with open('person-op.html', 'w') as f: 
+            f.write(content) 
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
+
+
+    def test_fix_cave_url115(self):
         ph = self.ph
-        response = self.client.get('1623/115.htm')
-        #self.assertEqual(response.status_code, 200)  
+        response = self.client.get('/1623/115.htm')
+        self.assertEqual(response.status_code, 200)  
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
+
+ 
+    def test_fix_cave_url284(self):
+        response = self.client.get('/1623/284/284.html')
+        self.assertEqual(response.status_code, 200)  
+        
+        ph = r'at a depth of 72m, there are large round blocks'
         
         content = response.content.decode()
         phmatch    = re.search(ph, content)
@@ -41,4 +142,25 @@ class FixturePageTests(TestCase):
             f.write(content) 
         self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'")
 
- 
\ No newline at end of file
+    def test_fix_cave_bare_url115(self):
+        '''Expect to get Page Not Found and status 200'''
+        ph = self.ph
+        ph = 'Probably a mistake.'
+        response = self.client.get('/1623/115')
+        self.assertEqual(response.status_code, 200)  
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'") # 200 & Page Not Found
+
+
+    def test_fix_cave_slug115(self):
+        '''Expect to get Page Not Found and status 200'''
+        ph = self.ph
+        ph = 'Probably a mistake.'
+        response = self.client.get('/1623-115')
+        self.assertEqual(response.status_code, 200)  
+        
+        content = response.content.decode()
+        phmatch    = re.search(ph, content)
+        self.assertIsNotNone(phmatch, "Failed to find expected text: '" + ph +"'") # 200 & Page Not Found
diff --git a/core/fixtures/expo_caves.json b/core/fixtures/expo_caves.json
index 9dfa78e..ff9ff79 100644
--- a/core/fixtures/expo_caves.json
+++ b/core/fixtures/expo_caves.json
@@ -16,5 +16,25 @@
     "description_file": "1623/115.htm", 
     "url": "1623/115.htm", 
     "filename": "1623-115.html", 
-    "area": [1, 8]}}
+    "area": [1, 8]}},
+    
+{"model": "core.cave", "pk": 350, "fields": 
+    {"new_since_parsing": false, "non_public": false, 
+    "official_name": "Seetrichter", 
+    "kataster_code": "", 
+    "kataster_number": "284", 
+    "unofficial_number": "", 
+    "explorers": "<p></p>", 
+    "underground_description": "", 
+    "equipment": "<p></p>", 
+    "references": "<p>", 
+    "survey": "<p></p>", 
+    "kataster_status": "", 
+    "underground_centre_line": "", 
+    "notes": "A 25m long (22m deep) resurgence in Altausee. At the bottom, at a depth of 72m, there are large round blocks.", "length": "", "depth": "", "extent": "", 
+    "survex_file": "", 
+    "description_file": "", 
+    "url": "1623/284/284.html", 
+    "filename": "1623-284.html", 
+    "area": [1, 11]}}
 ]
\ No newline at end of file
diff --git a/core/fixtures/expo_exped.json b/core/fixtures/expo_exped.json
new file mode 100644
index 0000000..9d3cc46
--- /dev/null
+++ b/core/fixtures/expo_exped.json
@@ -0,0 +1,18 @@
+[{"model": "core.expedition", "pk": 44, "fields": 
+    {"new_since_parsing": false, "non_public": false, 
+    "year": "2019", "name": "CUCC expo 2019"}},
+    
+{"model": "core.personexpedition", "pk": 681, "fields": 
+    {"new_since_parsing": false, "non_public": false, 
+    "expedition": 44, 
+    "person": 250, "slugfield": null, "is_guest": false, "expo_committee_position": null, 
+    "nickname": "Mike"}}, 
+    
+{"model": "core.person", "pk": 250, "fields": 
+    {"new_since_parsing": false, "non_public": false, 
+    "first_name": "Michael", 
+    "last_name": "Sargent", 
+    "fullname": "Michael Sargent", "is_vfho": false, "mug_shot": null, 
+    "blurb": "\n\n\n\n\n\n<p><img class=\"onleft\" src=\"/folk/i/mikey0.jpg\">\n<img class=\"onright\" src=\"/folk/i/mikey1.jpg\" height=\"400\"\nalt=\"\" />\n<b>Michael Sargent</b> CUCC<br />\nExpeditions 2014, 15, 16, 17, 18, 19.\n<p>The first second-generation expo caver in 2014, later members of this exclusive group were Dan Lenartowicz and Sarah Connolly.\n\n\n<img class=\"onleft\" src=\"/folk/i/michaelsargent.jpg\">\n<im\n\n<hr style=\"clear: both\" /><p class=\"caption\">Pre-expo (pre-student) photos from President's Invite (OUCC) \nand first abseiling instruction (Cambridge).</p>\n", "orderref": "", 
+    "user": null}}   
+]
\ No newline at end of file
diff --git a/core/models/caves.py b/core/models/caves.py
index ddb0255..fcaf8d9 100644
--- a/core/models/caves.py
+++ b/core/models/caves.py
@@ -158,7 +158,7 @@ class Cave(TroggleModel):
         for e in CaveAndEntrance.objects.filter(cave=self):
             rs.append(e.entrance_letter)
         rs.sort()
-        prevR = None
+        prevR = ''
         n = 0
         for r in rs:
             if prevR: