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It's to propel your bike across the line. The definition of propel is vague and untested so pushing could be illegal.
I'm with Corny on this one. Of the eight light controlled junctions I encounter on my 12 mile commute, I routinely jump at two. I see some people doing the I know this is wrong so I'll make an attempt to get off a bit move. I just make the unprotected right turn when it's safe for me and others, accepting that one day I might get a talking to or a fine.
I thought the specific offence was crossing the stop line after the light had changed. In which case dismounting to walk over/around that before getting back on and riding across the junction should be legal, right?
Am sure that'd be fun to test in court.