3 core electric wire (Gorton M18)

Hi there im trying to redo my bedroom for the wife on a tight budget.she wants 2 wall lights put up plus a socket behind the tv but im struggling to get long lengths off 3 core wire so I was hoping some kind people could help us out it doesn't matter if the wire has been used before because im going to put it into the wall and plaster over them if there's anyone that can help and don't live to far away I could use my bike to get to them from gorton area...I would appreciate it very much for the help many thanks