Thanks for your replies.

I've attached two further photos, the relay is saying 'Horn'. Maybe it's part of the manufacturers name?The battery has died on me again so I can't check if its still working. That said, it wasn't working as the internal had been removed but I could short it out for it to work.

The kickdown solenoid appears to be on the front section of the auto box.

The horn relay uses different coloured wiring.

I haven't spent much time on it today, the sun came out so I took the bike out.

I think I'll have to do the checks as you suggest and see if my horn still works. You may know the effort it takes to change a radio with having to disconnect the heater controls so I'll try and get to the bottom of it before I put the Radio in and avoid having to take it out again.

Thanks again.

Don't believe there is any selanoid for the early fuel pump wiring . It's just hot during ignition