Interesting! Now time for mine and RB's route:
Denmark Hill

Surrey Quays

New Cross Gate

Whitechapel

West Ham (
H + C)

Stratford

Highbury and Islington

Finsbury Park

King's Cross St. Pancras

Moorgate (Northern)

KCSP
(Metropolitan) 
Holborn

Bank

Waterloo (where we couldn't resist to BURST into a wonderful rendition of the ABBA great!)

Hampstead

Run to Hampstead Heath

Willesden Junction

Edgware Road

Notting Hill Gate
(District) 
White City

Sprint to Wood Lane

Hammersmith
(Circle) 
Earl's Court

West Brompton

Imperial Wharf.
Never know what the future may hold might be seeing more of us teaming up

never know.. Obviously it's up to him
