@brightontrader... Sounds like your little lake has a good head of sea trout..!! Do you know if they manage to make it back out..? Or do they get stuck once they find their way in..
Accidentally caught seat trout (out of season, whether it be on your own private fishery), in your case, would probably be best kept quiet. If you were to hand in catch returns with regular catches, not only might you find yourself in a bit of hot water with the fish police..

but they might approach you and insist on you putting up fish barriers or something, to prevent them from entering your fishery. Your case is a bit unique. Seldom does a fishery have a fish such as sea trout, find its way into its waters. There will always be fish caught out of season accidentally, but in your case it would be far more often than the norm, and i cant see them just leaving you alone....they would definitely jump on your case..
The Sea Trout you have in there now, must be from last years winter run...??? It hasnt rained for absolutely ages..!!
Rich