Having spent this last summer in London, I’d say that I was jumping half to most of the red lights..
Sometimes it’s after a good look, slacking off the speed, another good look and go..
Having said that, it includes rolling in front of the line for a head-start, going when the opposing light has gone red (after checking/clocking any car/bike RLJers!), turning left on a red when there’s nobody coming and going when the peds have all cleared the crossing…
There’s plenty of circumstances when it’s not UNsafe to jump a red.. and when it is, then waiting is fine. Its not hard to do a trackstand, or adjust your speed and wait for the peds to finish crossing either.
It may be illegal, but I don’t have pedal reflectors either!