If all else fails, pop to your local dealer and ask to have a look at an edge... play the "i'm thinking of upgrading" card and have a nosey
Oh I thought they were a US-only model since I'd never heard of the edge up until offered it by BA. I'll do that, thanks.
Edit - just phoned Bristol Street motors and they didn't know what I was talking about. They thought 'Edge' was a type of specification.
So whan I asked to see an Edge, they asked which model. Ka, Fiesta, Mondeo etc.
So it looks like the Edge is indeed unavailable in the UK.