This really is basic electrics, shouldnt be touching it if in doubt
www.diyfixit.co.uk/diy/electrics/socket_supply_spur/socket_supply_spur.html - 17k -
It's alright wiring from one socket to another but you then have to do a proper electrical test, ie an Earth Loop Impedance and if you have an RCD on the circuit then you will also need to carry out a RCD test to make sure it trips within the time specified by the new IEE regs....