Having got on board a Piccadilly line train this am that was on departure board as for T123 I got stuck into some work on my ipad. 45 mins or so later I looked up and I was at South Harrow... (Now on a bus and cutting it fine for my flight) - so in CC's (possible) defence, it is possible for people to be so engrossed in their ipad that these things happen
(Just passed over m4 and flight in 62 mins - think I'll make it, somewhat sheepishly)