I would like to know what time of day this was tested?
about 6 months ago I had a 2 hour wait in Waterloo from 4pm to 6pm. I connected PC via tether and ran a ping test throughout.
4pm I was seeing around 120ms.
By 5:05pm rose to around 2200ms
by 5:15 stopped working - no packets were pass
All tests to bbc.co.uk using Vodafone 3G.
This bears out my daily commute experience which is that I can't do anything internet in waterloo at rush hour.
Given I have wifi at home, wifi at work and wifi in the pub I only need it when commuting. Generally a bit rubbish then.