I use H07RNF for loose flex, is much nicer than arctic particularly in a workshop. Worth shopping around for as price per metre varies wildly and often cheaper to buy slightly more than you need to get the reduced unit price. All my sockets are wired with individual cores in trunking specced by spark. In retrospect I should have taken the hit and got better sockets. I went with MK and they aren’t the nicest, but budget was stretched already at the time.