Now we were on our way home! Along the path up from the estuary I spotted a snail.
Unfortunately I've been unable to ID it.
We were now face with an uphill battle to the bus stop, then a change of buses in the town centre. And a final walk (fortunately downhill this time) back home.
Exhausted, tired and a bit damp, but well satisfied.
EDIT: just had it identified in the forum as a Garden Snail; Cornu (formerly Helix) aspersa
SECOND EDIT: The ID was later corrected. I now discover it is a Copse Snail (which I'd never heard of). So I've changed the details on here.
The thread is here:
https://www.birdforum.net/showthread.php?p=3785210