Condor cycles - they have their own brand carbon frames, specialized and various others.

They're quite possibly the best bike shop in London and can do a full custom frame in either titanium, steel or aluminium should you want that.

Here's just one of their carbon frames - http://www.condorcycles.com/diamante.html

More here - http://www.condorcycles.com/road.html

Contact details - http://www.condorcycles.com/store.html

Here's my custom aluminium