...on the centre console, next to my 'leccy mirrors switch do? One single circular push-button type thing. Summat to do with the alarm maybe? Turns off ultrasonics maybe?

Doesn't look aftermarket, but can't find it in the book.

 

sure its not the wing mirror adjustor ****? or can be a swith for any old electrical switch for something previously fitted as on mine, it was a switch for a exhaust flamer which had been taken out from the boot and exhaust, but electrics still remained in the car

 

Ejector seat button

 

A picture might be of use.

 

sat nav

 

Will do. As soon as I get a chance.