If you want to spend ?100 Chris, then spend it on a good compact from Canon or Olympus. Your choice of digital in that price bracket will not buy much and as you'll only be taking pictures of big fish, they'll always be worth wasting a roll of film on. If you go sub-?150 digital you'll get less than usable shots if you want to reproduce them (ask your graphics people at EDP, they'll give you the SP about cheap digitals) If you get a really good fish (sorry another really good fish) and use a cheap digital then the quality would be unacceptable for reproduction in the angling press and you'll have learnt a lesson the hard way. Also whilst you'll probably get a facility to connect a tripod or bank stick, you may not have a self-timer or any of the helpful features that a small compact will have. Canon and Olympus produce some remarkably good small cameras which have the features that you are looking for, but more to the point they have small seriously sharp lenses which in all but very low light or 'moving subject' situations will produce usable pictures.
If you can find one that's weatherproof then grab it. Don't forget you can have pictures developed onto a digital disk that will allow you to manipulate the image or send them as e-mail attachments.
I have four cameras knocking around the office including 1 megapixel and three megapixel digitals and an Olymus SLR with all the lenses. The one I take fishing is an old Olymus compact.
Whilst it's not a compact, the camera that a certain Mr Wakefield has on offer is a steal and will not only have a self-timer but may even have facilities to connect a foot cable release. Absolutely the business.