1999 Duetto - Heated Rear Door Windows

Hi all - we've just had a few days away to test the "new" van's systems and all seems well except that there does not appear to be any power to the heated windows in the rear doors. The dash switch light doesn't come on, the fuse is intact but I can't find the supposed relay in the fuse box and there is no 12 volts at the heating elements. If anyone has come across this fault I'd appreciate their answers! Many thanks in advance.
Jock

Just for info - yes they are connected and fed from relay X1/K1 in the main fuse panel. Answer provided by Ford Transit forum.
jock