diff --git a/core/views/statistics.py b/core/views/statistics.py
index f3c5974..aa13fbf 100644
--- a/core/views/statistics.py
+++ b/core/views/statistics.py
@@ -28,11 +28,13 @@ def legs_by_expo(expos):
     for expedition in expos:
         survexblocks = expedition.survexblock_set.all()
         legsyear = 0
+        nblocks = 0
         survexleglength = 0.0
         for sb in survexblocks:
             if not sb.foreigners:
                 survexleglength += sb.legslength
                 legsyear += int(sb.legsall)
+                nblocks += 1
         addupsurvexlength += survexleglength
         addupsurvexlegs += legsyear
         
@@ -42,7 +44,7 @@ def legs_by_expo(expos):
         else:
             success = ""
         tourists = PersonExpedition.objects.filter(expedition=expedition, noncaver=True).count()
-        legsbyexpo.append((expedition, {"success":success, "people": expoers,  "tourists": tourists, "nsurvexlegs": legsyear, "survexleglength": survexleglength}))
+        legsbyexpo.append((expedition, {"success":success, "people": expoers,  "tourists": tourists, "nsurvexlegs": legsyear, "survexleglength": survexleglength, "nblocks": nblocks}))
     legsbyexpo.reverse()
     return legsbyexpo, addupsurvexlegs, addupsurvexlength
     
diff --git a/templates/statistics.html b/templates/statistics.html
index c60b297..74961fc 100644
--- a/templates/statistics.html
+++ b/templates/statistics.html
@@ -25,12 +25,15 @@ These authoritative results are maintained
 in an <a href="/repositories/loser/.git/tree/docs/smklengths.ods">ODS-format spreadsheet</a>.
 <p>
 
+<!--
+legsbyexpo: ((expedition, {"success":success, "people": expoers,  "tourists": tourists, "nsurvexlegs": legsyear, "survexleglength": survexleglength, "nblocks": nblocks}))
+-->
 <table>
 <tr><th>Year</th><th>Survex<br>Survey<br>Blocks</th><th>Survex<br>Survey Legs</th><th>Survex <br>length(m)</th><th>Cavers</th><th>Non-cavers</th><th>meters/caver</th></tr>
 {% for legs in legsbyexpo %}
 <tr>
   <td style="text-align:center"><a href="{{ legs.0.get_absolute_url }}">{{legs.0}}</a></td>
-  <td style="text-align:center">{{legs.0.survexblock_set.all|length}}</td>
+  <td style="text-align:center">{{legs.1.nblocks}}</td>
   <td style="text-align:center">{{legs.1.nsurvexlegs|rjust:"10"|floatformat:"0g"}} </td>
   <td style="text-align:right">{{legs.1.survexleglength|floatformat:"0g"}}</td>
   <td style="text-align:right">{{legs.1.people|floatformat:"0g"}}</td>
@@ -39,9 +42,7 @@ in an <a href="/repositories/loser/.git/tree/docs/smklengths.ods">ODS-format spr
 </tr>
 {% endfor %}
 </table>
-<p>One Survex Survey Block is one *begin/*end block of data in a survex file. 
-Some files from other caving clubs may have a convention of using many more blocks per file than we do, e.g. if the 
-file is exported from other software into survex format, but each block is recorded on a single day.
+<p>One Survex Survey Block is one *begin/*end block of data in a survex file. Different survex blocks in the same survex file can have different dates and surveyors.
 <p>The number of cavers excludes those attending who were not caving. This is something of a distortion as non-cavers 
 may still be doing useful expo-related work such as prospecting, ferrying gear and preparing food. 
 Non-cavers also include the bier tent and Rover Richardson, see <a href="/folk/index.html">the folk list</a> for details.
diff --git a/templates/survexfilewild.html b/templates/survexfilewild.html
index a210058..42d1f23 100644
--- a/templates/survexfilewild.html
+++ b/templates/survexfilewild.html
@@ -63,7 +63,7 @@ Length of survex data referenced by wallets in this year {{walletslength|floatfo
 {% for legs in legsbyexpo %}
 <tr>
   <td style="text-align:center"><a href="{{ legs.0.get_absolute_url }}">{{legs.0}}</a></td>
-  <td style="text-align:center">{{legs.0.survexblock_set.all|length}}</td>
+  <td style="text-align:center">{{legs.1.nblocks}}</td>
   <td style="text-align:center">{{legs.1.nsurvexlegs|rjust:"10"|floatformat:"0g"}} </td>
   <td style="text-align:right">{{legs.1.survexleglength|floatformat:"0g"}}</td>
 </tr>