no doubt , but UK government loves to put stupid rules on everything !
you'll like this , we in england can't use .223 on roe deer but you can in scotland !
now i might get this wrong and i cannot be bothered to check but in england you need .240 min calibre and 1750ft/lbs of energy but in scotland you need .240 min calibre minimum velocity of 2450ft/s and 1700ft/lbs of energy and i'm pretty sure it used to be minimum 100gr bullet but with us being forced to use non toxic now that minimum bullet weight has been dropped this is for 'big' deer
in england we can use .223 and the likes on CWD and muntjac as long as its a 50gr bullet and 1000ft/lbs but roe needs the big deer calibres and the above regs but in scotland you can use .223 on roe deer
so a 223 is legal in Scotland for roe but not England but in England you can use a 45/70 but it doesn't meet the velocity for use in Scotland - make sense of that!