Hi Simon,
You are correct with the Heron but although as I mentioned on another post, its perfectly legal, to take pheasant, duck, grouse, woodcock, partridge and (this may cause a bit of a stir) Canada Goose at the correct time of the year. Also added to the GL's in 2010 are Ring Neck Parakeets and there is also the Monk Parakeet. And I wont mention the other one on the GL because once a newbie gets the species name they go out and 'have a pop' at all the members of that species and not just the one on the list!
Tony
ps WML GL04, gl05 and gl05 are the documents you need to read for