Heated front screen help!

Anyone out there know where the fuse and relay for heated front screen are located in a Disco 2? I have no power coming to the snap connectors on the screen, although the switch light is coming on. Theres no mention of front screen on any of the fusebox covers, nor in my Haynes (Mk 1) manual.
cheers folks.

located in the engine compartment fuse box - fuses no. 7 & 8 (both 40a) 1 for LH & 1 for RH