"Ham" was being dropped because browser autofill started volunteering
people's actual surnames in the hidden spam trap field.

meet.coop-registration-form.md

@@ -15,8 +15,8 @@ your details, and someone will get back to you shortly via email.
 <label for="email">Email address</label>
 <input id="email" name="email" type="email" required>
 </div>
-<label for="surname">This should be left unchanged</label>
-<input id="surname" name="surname" type="text" maxlength="40">
+<label for="emptyfield">This should be left unchanged</label>
+<input id="emptyfield" name="emptyfield" type="text" maxlength="40">
 
 If you don't mind, it would be useful for us to know what you're intending to use meet.coop for (it isn't restricted to social.coop business!)