Thanks guys this is all great info, I don't need to worry about buying a cylinder as I am as diver and have one ready to use.
I have held an s200 and although it was OK to hold it didn't feel quite right.
I think I will definitely go and try few out then look to buy second hand.
Was looking at a leapers accu shot scope 4 to 16 for £150, so thought £350 would get me a great second hand starter rifle?