Thanks Shaun. Had a bit of a panic today. Went round checking all the obvious and found that the washers didn't work, rear number plate lights and horn! Only had a couple of hours before leaving for work tonight!
Washers turned out to be the stalk switch just needed the contacts cleaning and the rear number plate lights had a broken connection under the boot lid.
The horn seems to be drawing a lot of power, not sure why

I've managed to get it temporarily working by disconnecting one of them so it's not dual tone but at least it will work for the MOT tomorrow and then I can delve deeper later. I suspect there is a poor earth somewhere......the usual culprit.