Hi Ian, sorry about your last post disapparing. I've been having some major hosting problems, hence why the sites been up and down and a small amount of data has been lost from the forums. It's a standard horn andd I think it goes in the standard place, I'll try and get a photo of it for you later. ...
The roof is not just painted black, it's actually had a vinyl roof applied. I'm sure I've seen this car at a show many years ago, but can't remember where and when.
That car is R1006 and I've updated the register accordingly.
The dealer in question, www.gcminis.co.uk, used to have 3 ERA's, including a very unusual one with an interior trimmed in Red and Cream leather with walnut. They only appear to have this one now though.