In reply to foxjerk:
> apologies for the stupid question in advance - how does a big wall solo climber retrieve placed gear from a pitch? ab off the belay and re-climb with an ascenders etc?
To add a little more detail to the last but one comment. Pull up the haul line, which it tied to the end of the lead line. Ab down the haul line. Ascend the lead line on jumars cleaning the protection as you go.