I didn't know they did dangerous game courses in the UK! I'd be interested to get more details if you don't mind sharing them? I got my 375 and a slot for a 300WinMag barrel because I told them I was going to Africa and sent them proof of booking. It was fortunate because it was an opportune purchase and I had a trip coming up last year even though I didn't take the rifle. If you can demonstrate that you have a good reason for owning a larger calibre rifle you should be OK but I suggest a 375 will be easier to obtain. (Firearms Licence Constabulary dependant of course.) You will probably find ammunition more readily available unless you home load and can please yourself. This year the 375 will be coming with me on a plains game hunt and I spent a couple of hours at the range last week zeroing it, it's a pleasure to shoot.