As long as you got land you can shoot over, and there are,vermin, foxes deer, or wild boar, on the land for the larger calibre rifle, you are OK, but some parts of the UK, insist you pass the DSC1, but I have never had a problem,but I have had an open certificate since I was about 20, and you got to have a letter of your doctor as well, it is getting harder and harder, I feel sorry for the younger people who want to get into it, if you haven't got land, then you will have to join a club, and after your probation period you can apply for a firearms certificate.
A suppresser is classed the same as a rifle you got to apply for it, can't see the sense in it myself.
There are clubs I joined one not so long ago so I can shoot on MOD ranges
Hope this helps