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Well, I purchased a new mirror glass (a proper Lucas spare part) and it arrived safe and sound this morning... I then removed the old cracked one (carefully because it was glass) only to find that the old one has two little wires attached to a pad on the rear, running from the wee motor that Toureman mentions. The new one is exactly the right shape and size but has a gap in the adhesive backing where the wire pad would be. Am I correct in thinking that I've bought the wrong mirror glass ? I did check in my Haynes Manual and the car manual but there is nothing mentioned about changing the glass in an electrically adjustable mirror, just how to change the whole mirror assembly itself. The site I purchased the mirror glass only lists the two mirror glass types I purchased (left and right) - there's no listing for an *electric* version.... doh