I would get an expert and also fire insurance.
Lighting and sockets are on seperate circuits over here, not sure on your regulations. if the socket is taken of the light circuit the size of the wireing is restricting the flow of current, Amps. either that or there is a bad connection in the circuit. either way this can lead to heat being generated in the wiring or at the connection, get it checked out asap please, and i would not use the socket till then.
