Hang on a mo - why replace the utterly crap ST headlamp with the same again, when Paul Gellar at Ducati Designs makes such a highly rated projector replacement for about $US450? - dunno what postage/duty to UK will be - haven't got around to ordering myself yet.
http://www.ducatidesigns.com/ Usual disclaimer - no connection, but just seems like a really decent bloke making really good stuff...
HTH, Richard