Ok this is almost definatly what it is

there are 2 of the smaller type relays at the back of the fuse box giv them a wriggle and u should see some light.

they are prob melted i used to have this quite a lot on mine but it would be when u were driving at night so plunged into darkness

if no joy get a disposable nail file and cut it down so u can file the contacts a bit as they're probably corroded

HTH

let me know how u get on

Mark