I got a Lab from a rescue centre in Lancashire 20 years ago, for a nominal fee. They check you out to make sure you are offering a good home. Mine came from an elderly lady who had a terminal illness and at 18 months old was house trained. Had her till she was aged 17, which is good for a Lab. Either they had her spayed or I had to let them know if I had it done, cant remember which. This is so breeders don't get them cheap or as the girl said to me, there are too many that is why we do this, which I agreed with anyway as I had no intention of breeding. Try this centre it could be the one I used, just not sure now.
Labrador Rescue {north west} Area,
Malt Kiln Farm
Tinklers Lane. Eccleston. PR7 5QY .01257 452500