Broomhill Flash - Lesser! Canada Goose

Dad and I had a good 2 hours at Old Moor Wetland seeing Pintail, Common Sandpiper, Pink Foot and stack of Wigeon and Teal. After a mug of tea and a few purchases in the shop we went to Broomhill Flash. The Flash had planty of Wigeon, Teal, Canada and Grey lag Goose, Tufted and Ruddy Duck and also half a dozen Goldeneye. We had been there an hour when the canada's were spooked from the far bank on to the flash. Dad picked up a couple of canada's swimming towards us. One was a lot smaller then the other (see pics above). I got some photos with the camera phone. I think that the smaller Goose is a variety of Canada Goose called either Lesser Canada or Cackling Goose. Nice find. The only question is whether or not it's an escape... Here's the report and earlier sighting on BirdGuides