This was platform 1 at Twyford, where the only stop board is a "HST▸ Stop". The train went all the way to the end of the platform.
Not quite right. There's an 'S' board (and associated mirror) at the end of the platforms where all Turbo trains (and 180s) will stop regardless of length - 6-cars being the longest accommodated, and there are 'HST 2+7' and 'HST 2+8' boards located just off the end of the platforms which a HST would stop at should it be in reverse formation. A normally formed HST will stop with the power car just off the platform edge.
