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In London, Google was paying GBP 70-80K, same for Skype/Microsoft.

That seems low for London since it's also a city with high living costs... Do they give any other extra benefits, or what about bonus/stock?

Surely there is a big range of salary from intern -> managing director? Does "the mean" matter in this discussion?

That was for experienced engineers.

I think you must be referring to base pay, not bonus or equity, which is a very large part of total compensation.