John Knibbs
Any good-quality telescopic sight can be fitted to your rifle, and it is worth spending your money not only on the scope but also, and most importantly, on good mounts.

Your local gunshop will stock a range of mounts. As your rifle is not recoil-less, I would recommend a one-piece mount of a height to suit your chosen scope.

You should be able to buy one for about £20.

As you may be shooting in poor light, you should consider a good-quality variable magnification scope in the 3-9×50 range, which would give you a full field of view and a choice of magnification to suit poor light conditions.

You should find what you want for £50-60.