I measured it - from the end of the westerly stop to the front of the
easterly stop is 110m (ok - it felt like under 100m). The easterly
stop has no markings - it is nearly up to the traffic lights in the
first of three lanes at the mouth of the junction. The stop beyond
the junction was a bit further than I thought - maybe on the day I was
on it, it pulled up a bit early!

Fair enough - though in mitigation may I plead that I was trying to
measure between the 2 bus stop posts and flags[1]? If you are taking
the shortest distance between the cages[1] on the road (where there is a
cage) the answers will be different. IIRC TFL aim for a minimum of 33m
cage.

[1] I hope I've recalled the right terminology but in case I've
cocked-up by "cage" I mean the box painted on the road

--
Robin
PM may be sent to rbw0{at}hotmail{dot}com