I'd have no objections to baliffs checking anglers bags. I only ever take what I'll eat for the pot, and only if it is size.
Really annoys me when I see people taking everything they catch, no matter what the size, and leaving rubbish all over the place. As the people who frequent the marks for fishing anglers should take responsibility for the state they leave it in.
I use to go to the mull of galloway on a frequent basis, and on the last few trips, we took 4 -5 black bin bags of other peoples rubbish away. P*sses me right off, and the last few trips we have gone to less frequented marks.