From High Wycombe train to Baker Street Underground Station, Tube to Green Park Underground Station, then Tube to Knightsbridge Underground Station. 33 min £19. From High Wycombe, High Street (Corporation Street) bus to Uxbridge Underground Station then Tube to Knightsbridge Underground Station. 1 h 37 min £9. From High Wycombe taxi to Knightsbridge. 39 min £129. From High Wycombe drive to Knightsbridge. 39 min £5. From High Wycombe rideshare to Greater London. 58 min £3.