thanks folks.
Won't post a picture just yet - don't want to upset the headset police.
Final spec; Mavic rims, carbon seatpost, brooks titanium saddle (present from Mrs), thorn comfort bars, ergon grips.
Took it out for a 10 miler yesterday just to check it over. Ergon grips and brooks saddle were a great success - v. comfortable. The bike is very swift - I had no idea it would move so fast - great acceleration. Passed 3 guys on MTBs - they looked really baffled - couldn't make out quite what it was. LOL.
Will now play around with stem/spacers etc.