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@dommyracer
Which was a pack of bullshit made up by someone.
Signal timings are ultimately the responsibility of the highway authority for the junction, but are usually worked up by the Department of Traffic Operations, a section of TfL. They apply lots of complex maths and statistical / flow analysis / modelling to provide the optimum timings based on the relationship to the other nearby junctions / streets etc.
They are reviewed on a constant rolling program - all this talk of Boris "I'm going to review all traffic lights in London" is just BS, that's what the DTO do anyway on a day-to day basis.
If you think the timings / phases need to be altered, get in touch with the relevant highway authority - thats the Local Borough, unless it's a Red Route then it's TfL.
Sometimes it can be a fault that has gone unnoticed - a lot of key junctions are linked up to something called SCOOT, which is a type of Urban Traffic Control or UTC - this is where signals are linked by computer and will adjust their timings in real time according to traffic conditions - SCOOT relies on induction loops buried in the road surface (you may have noticed these showing through when the road surface is worn) and if they are faulty of miscommunicating it can fuck things up.
Best thing to do is contact TfL street faults on 0845 305 1234 or londonstreets@tfl.gov.uk to check it's not a fault first.
If it's not, then go to the highway authority and get them to check it out.