I would agree that the hw100 is the best rifle for hunting and a bit of target shooting or HFT comps I would go with the rifle rather than the carbine version of that rifle. Also you can usually pick one up second hand most places have a look at Blackpool air rifles second hand section there usually is a very good selection you get a small warranty and at a small fee get delivered to your closest gun shop.
Scope wise for hunting and target shooting fixed mag mtc viper 10 x 44 or the hawke tac 30 fixed mag both good all round scopes new around £200 each give or take a few quid. Also I personally go for a dive bottle a lot less bother and you will get one second hand too. all should just come in under your budget also sling to carry rifle around the fields etc and a gun bag too.