Powersteering runs on the fan belt doesn't it? and there's an alternator belt I'm sure.
Eh?!
The belt on the left hand side of the engine is the Aux belt. It runs the alternator and powersteering (also the aircon in non Cup models). It needs to be changed the exact same time the Cambelt does as the Aux belt needs to be removed in the process. Trust me.
The only benefit here is the Cup doesn't have Air Con, meaning the Aux belt is £13 instead of £120 and there's a smaller labour charge as it takes less time to fit.
Cambelt: Every 5 years or 74K, WHICHEVER IS SOONEST
Auxbelt: Every 3 years or 34K, WHICHEVER IS SOONEST