Picture posting is enabled for all :)
Amphibian I feel for you, do you have an allotment manager that you could talk too? Do the other plot holders have the same problem?
The edge of Tunbridge Wells? Roe or fallow are the most likely, though I could be wrong.
Do you know much about the deer - i.e. type and herd size? (wild or owned, local hunting laws etc). The geography of your plot (i.e. are you on an edge of the grounds or not) and how the deer get in is worth looking at. Perhaps there is something you could grow at their entrance into the ground that would keep them away (?vicious spiky plants etc)...or even razor wire via ebay (i.e. http://cgi.ebay.co.uk/Razor-Wire-Security-Fencing-450-mm-boxed-warning-sign_W0QQitemZ230002646256QQihZ013QQcategoryZ26197QQrdZ1QQcmdZViewItem)...there is always corn-fed venison recipes?Or maybe round some up and sneak then into the Council offices.Either way good luck.
it has a shop and toilet regular manure deliveries