Most of the world's population lives inside the Valeriepieris circle https://en.wikipedia.org/wiki/Valeriepieris_circle which is covered by the time zones UTC+5 through UTC+8.

So if you want to be as close as possible to as many people as possible, somewhere in Myanmar would be a better choice than London.

Of course the calculus changes if you also consider how much money each of these people has access to.