UPDATE: Hi Everyone. I went to the clay pigeon club again today and had a go with my dads Lamber shotgun. Again I started suffering with a bruised cheek. After the shoot I went down to my local gun shop in Sheffield. I got them to have a look at the fit of the gun and they informed me that the stock was too short and would also need casting. Obviously I don't want to cast my dads gun.

I've decided i'm looking for an left handed over and under (second hand) in the price range between 300-500 (maybe a bit more if it was a nice gun). The gun shop suggested that I bought a second hand shotgun and had the stock recast from right hand to left hand. However, it was suggested in another gun shop in Sheffield that casting a stock may not be permanent and eventually the stock shape would change back to the original shape.

Can anyone suggest a good place to get a left handed over and under shotgun in the South Yorkshire area? And could anyone give me a bit more information about casting of stocks on second hand shotguns?

Many thanks for all the comments.