In Avon and Somerset they ask that you do a DSC1 before they will grant you a centrefire for deer, but that is police choice not home office regulation you should be able to have a caliber of rifle you have good reason to own, but stating this to your feo will just get you grief, that said if you don't know what you are doing going out with a mentor and even doing a course not necessarily a DSC1 can only benefit your own stalking experience, its not just about safe shooting with the right caliber when you grollach you need to know whether or not the animal is in good health and fit for consum