But London has been taken over by the ecologist dictators who enjoy your pain ("bleeding heals") and that's why London is a city with no future.
And I say Barcelona but I could say Warsaw, Paris, Kiev, and so on.
London had very few roads already and the current major took care to close them one by one.
Also Barcelona has terrible air pollution.
Instead London decided to put bus lanes and bike lanes and wider sidewalks
Very ecological but fatal for the city, which has the worst commute speeds anywhere in Europe.
That's a competitive economy? Nope!!
Argh, we’ve got people from alternate universes posting here now.
More seriously, going to Gatwick… do you not just get the train?
You go to Gatwick airport you take a train, which is very good (although pricey), same for most of the main airports around London.
You should definitely avoid crossing London by Uber, as there are plenty of excellent public transport options.
(The UK rail system is a uniquely user-hostile one, in that it seems designed to fool you into paying more than you have to.)