Moving electrical socket from over hob

Ok. It should end up 200mm from edge of hob, minimum. I always do them 300mm.

You need too ensure that the socket is at least 300mm from the hob to pass building control. Hope this helps any issues give me a shout thanks Ben.

Building regulations gives a guidance measurement of 300mm away from the edge of the hob or sink.

Buy 13 Amp connector blocks or wago clips, safety cover for the join, 2.5mm twin and earth cable and earth sheath. Remove the old tiles. Turn off the kitchen sockets. Plug something in to be sure that they are switch off. Unscrew the socket. Note (or photograph) where each wire goes. Undo the wires. Put a clip or connector block on the end of each wire to keep them safe. Take the old back box out. Put it in the new place. Draw around it. Channel into the wall to accommodate the back box and incoming wire. Fix the back box into the hole. Add more cable to extend from the old to the new. Strip the ends of each wire to connect. Cover the earth. Blue to blue, brown to brown, earth to earth. Put this join in a safety box. Strip the other end of the cable. Cover the earth wire. Connect inside the socket as before. Put it back together. Turn on power. Carefully test new socket. If it works, decorate and tile. EXTRA INFO ADDED TO QUESTION It seems to me that you don't have room to safely fit a socket next to the hob. Perhaps you could think about what you are intending to use it for and could that item be plugged in elsewhere. If you get a situation like "I could plug the toaster in there but I need that socket for the kettle", could the kettle be plugged in elsewhere? Are any of your sockets single (1 gang) sockets? If so, any proper DIY store will sell special sockets that convert a single socket to a double socket without changing the back box. The wiring is identical and any competent amateur could do it. Try this: https://www.screwfix.com/p/lap-13a-converter-socket-1-gang-to-2-gang-switched/108cc