There's a moral to this storey >
Ed met me to read my codes 'cos my Check Engine light was up -
He read the codes and subsequently sent pics of the results -
He got a nice shiny working mirror -
Then he told me my engine is stuffed !!
Who needs friends?
Only joking - glad it all worked out Ed.
Incidentally - on my XK8 (now deceased) the rear view mirror gave a 'double vision effect (it looked as if cars following has two sets of headlights - one above the other). I couldn't find a mirror and couldn't live with the weird effect on mine, so I bought a 'glass tile' (mirrored plastic) from our favourite shop and, using a card template stuck diagonally across it, cut out a new glass using a Dremmel. Two bits of number plate double sided tape and I had a perfect mirror.
The mirror is recessed into the frame so the addition wasn't visible - just it didn't darken (which didn't worry me).