It could be the case. London for all sorts of reasons remains the epicentre of the English-speaking world. If the United Kingdom sneezes, the rest of us Colonials and Americans will catch 'flu. Let's hope the current United Kingdom truly lives up to the numerous great leaders it had had in the past.
It's funny you should mention London - the swing to the Tories was stronger there than any other part of the UK. Note how the Tories took Putney, Hammersmith & Fulham, Enfield Southgate and Wimbledon. I go on about Hammersmith and Fulham as that's my home, but the achievement is worth noting - it turned from a Labour marginal seat to a Tory safe seat with a margin of over 5,000 votes.
Regards, Ivan