I'm sure I'm not the only one who's played around like this, during nearly 30 years of commuting into central London by bike. It used to happen a lot around the 80s but don't see it much now:

You're filtering past slow-moving traffic and you and the traffic stop.
The driver to one side of you gets it into his head that you want to get into the gap in front of him (usually you never do) so moves forward aggressively to close any gap right up.

I used to play their game, by inching forward with front wheel pointing a little to the gap. Sometimes it would drive them crazy and they'd inch forward in lurches, as close as they dare to the back of the car in front.
Over the years I determined to get these sorts of drivers to hit the car in front, by mimicking their actions until my way forward became clear so I'd nip off and give them a wave.

Well, I only managed it once. Gently inching forward with front wheel pointing a little towards the gap (but never looking directly at the car and keeping clear of its mirrors) provoked the car driver to lurch forward maybe 3 times, smacking right into the back of the car in front.
Being careful to avoid the opening door of the car in front as the driver got out, I gently pulled away with the usual wave.

Can you still do that sort of thing/are there still those sorts of aggressive drivers in London's traffic? It's a longish time since I rode into town regularly.

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TTR250 - London to Cape Town