Sounds like it could be a busted relay to me, They are not that expensive, do you see which relay it is ?
Pull it out and try re fitting it, if this does not work, see if you have one in another vehicle that matches it , try this one to see if that works, if so then its time to go shopping, try
http://www.roverparts.com/ Atlantic British, under their dropdown menu you will find the relays.
Good Luck.
John.
