I had a look where the horn was on my GP and how easy it was going to be to get to it so I could wire in another (via a relay).
Well, it appears the whole of the front of the car needs to come off and then you can get to it, in front of the radiator.
There must be an easier way to tap into the horn wire (I want to leave the original horn fitted anyway), anybody know the answer?
Then I can fit a replacement horn in the engine bay somewhere.
Incidentally the Stebel Nautilus is looking quite good for about £20, as although it is an airhorn it is very compact and INSTANT (says the manufacturer's website) due to its special design - a nod to my previously noted fact that I found a perceptible and annoying delay between pressing the horn button and getting a sound out of air horns I had in a previous car (a Ford Cortina Mk III for those old enough to remember them! Ah those were the days, real Weber carbs, rusty wings and proper leaded petrol!!!).