Sorry I didn't get back to you back to you 'but my taxi broke down on Tuesday which put me off the road for two days.
The good news is it's still available direct from Hella in Germany on a two-week backorder.
The bad news is (I hope you're sitting down) it's £83 38 including VAT and delivery

apparently it's not an off-the-shelf part they have to make it especially.
After a hell of a lot of searching there was only one person who could sourc this part 'Martin at
http://vagparts.com/ this bloke is an absolute diamond and if you want to give him a call he's number is
01793-487700.