I have a 55gallon. I have been interested in cuttlefish for a long time but never actually took the plunge to setup a tank for them. I think they are very cool and interesting. I'd also like to "learn" from them. I would want to observe there behaviours, growth and feeding etc. This isnt just an experiment though, I dont know what it is but there is just something about them.
pretty much the same thing here. pretty much the only cuttle that is available often for that size tank is the bandensis, so you are probably going to want to get a bigger tank if you want much of a chance of getting a cuttle in england. I believe officianales often lay their eggs on crab pots off of the british coast, so if you get in contact with a fisherman once you have a larger tank, you could probably pay them a small "bribe" to get them to bring you some eggs back.