Wimbledon to South Wimbledon is quite a trek too!Several on the Tube.
Warren Street to Euston Square
Euston Square to Euston
Bayswater to Queensway
Hammersmith (Piccadilly and District) to Hammersmith (Circle and Hammersmith & City)
Epping to Harlow, the latter not on the Tube.
Away from the Tube, Bourne End to High Wycombe is much quicker by bus (and Plusbus is valid).