OK, I have checked the fuses and they all seem fine.
It is bizarre: On the indicator stalk it works turning the main beam switch round but not up and down for indicators, on the windscreen wiper stalk it is the other way round. It works to turn the front wiper on, but not to turn the rear wiper on.
I will have to take it in to the Honda dealer in Taunton on Monday I think. It sounds like a serious electrical problem to me.