I have just found out why we have so many toads on our site.

Apparently when the Halifax Building Society(as it was then) built its new computer site just on the road from us, they disturbed thousands of these toads, and sensible little things made their way to our allotments.
I can remember it being in the local paper and people stood watch all night at this time of year making sure they did not get run over as they were crossing a busy road to get to their breeding place.
The old timers on this site remember lifting cold frame lids and seeing hundreds of them taking refuge.
Rosemary