Hi im in the UK as well but moving to canada in September, where ill be able to hunt. id be very careful if your going to keep/use a crossbow in the UK as the police dont look kindly on ppl using then, i believe its still legal to buy one but not to hunt with one or even carry it around. if you get stopped by the police carrying a crossbow even disassembled in a bag your looking at being arrested and facing charges.

Id say just move to canada ! then you can do what you like within reason legally as the UK sucks.