Sure. My source is basically http://www.legislation.gov.uk/uksi/2002/3113/regulation/49/made "The red signal, whilst it is illuminated, shall indicate the period during which, in the interests of safety, pedestrians and pedal cyclists should not use the crossing" - my emphasis. If you can see it's safe to do so, I know of no offence committed by riding on the carriageway (or turning to/from it or whatever) - why would it be? Cycles may be ridden on it anyway. It would be good to have the original file on the dropbox too, wouldn't it?