A power circuit should be run in 2.5mm Twin & Earth cable, which would get put onto a 32A breaker, the cable going to the socket in your garage should be 2.5mm T&E.
If it was run in 1.5mm then it would be on a 16A breaker but that size cable is used for lighting not sockets.
But either way it seems that you would be fine running your gear from the sockets that you have, regarding changing the socket, I would not worry about it as both ccu's have RCD'S.
I would still get a smoke alarm and fire extinguisher(Class E) just to be on the safe side, all the money you spent on equipment a few extra quid for peace of mind is priceless.
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