I do have friends that do airsoft properly and they have kitI can borrow. I will go along with them soon and see how it goes and you ever know if I enjoy it enough i will go out and get a proper shooter, however for now it's just for having a bit of fun and a laugh.
I just read through that link you posted and it looks top stuff - thanks!
EDIT:
New BB's arrived today and the problem is completely gone, now works as expected. Thanks for all your responses.