go for it
what does that work out at? £20 scope £12 cleaning kit £7 slip £5 mounts so roughly £45 ish for the rifle if you get close enough it might be ok but you do seem to want a lot out of the kit for your money
my young brother in law had the b2 years ago and compared it to my diana g80 that was until he cocked it and the action broke away from the stock and smacked him in the jaw
under the right circumstances most 10 ftlbs rifles will do the job and if you go c02 at least you can shoot the empty carts I know where you are coming from with the limited budget but if you commit to the rifles you are thinking of and don't like it you will be throwing away your money as they really have no s/h value where as if you go s/h and don't like it there is every chance it will hold its value or even increase Its easy for most of us to preach as we already have rifles we like but we all started some where I had a Relum tornado as my intro rifle thought it was the dogs do dahs when I was 14yo now people say they were utter cr*p but I loved and cherished mine and the local wild life never complained cos when they saw it they were gone
So go ahead it does seem a good deal fo the money just bear in mind the advice you have asked for and been given from those who took the time to do so
Good luck and happy hunting
eric