@Blob thanks for these. The horn diagram would seem to be correct, however the washer shows 2 x relay but the car shows on 1 x washer relay suggesting that this may not be correct?

I have just checked the relay operation for these two items (going by the top of the fuse/relay cover in engine bay) and the horn relay operates suggesting a dead horn - need to get hold of one (eBay here I come) The washer relay doesn't...

My daughter has a 2010 Discovery 4 HSE and there are some electrical issues that may be related. Specifically none of the washers work, but neither does the horn. I am not sure what else might have stopped working, but these two are important. I...