Accumulated most of the bits for this over the last few months and now the weather is warmer thought I should get round to doing it.
First issue is the mirror fitting.
Top mirror mounting is the new (out of a TT I think, bought it ages ago on ebay), Lower mount is the one out of my A4. As you can see completely different sizes where it attaches to the windscreen. I can obviously cannibalise bits from the old one but its missing screws etc so not sure it will work.