I recall an occasion many a moon ago now, on a foul winter evening - raining the proverbial cats and dogs - at lewisham. It was a sardine filled Six (4+2) car unit (two on the end, i believe).
Anyway, the driver stopped - at a point on the platform, as I was in the rear car I can't say where he stopped, but it was sufficiently far enough down from the canopy to warrant several outbursts from ajoining passengers squeezing on about where the train had been stopped.
I imagine it is tricky, especially at lewisham, for shorter trains given the curvature of the platform (No. 4, I believe it was - Down North Kent line anyway).
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Yes, all the stop markers on that platform have to be wayyyyyy down the platform. Otherwise the platform end signal (protecting Courthill Loop Jn) can't be observed by the driver.