As it has allready been mentioned +
Budd - perhaps some Black Tie accesoires?
Savile Row no 1 - Gieves & Hawkes, marvelous building, used to be The Royal Geografical Society - this is where David Livingstone planned his African travels! - have your shoes shined by "The Shoe Snob".
Turnbull & Asser - bespoke department, entry from Bury St., ask to see their scrapbook, you wont believe what you see!
John Lobb, St. James's - ask if you can see the downstairs in particular the last room and the cabinets with famous lasts - one for americans and another for us :-)
(if you are lucky you will see them working on my new suedes
The Food Halls at Harrods
Paxton & Whitfield Cheese shop in Jermyn St. - buy the Stilton!
Afternoon tea at The Dorchester, Champagne, the lot!
221 B Baker St.!
Have a shave at Truefitt & Hill in St James's
Get Mariano to take you to dinner in his club around the corner from the shop - and try his favourite squash frités