For what it's worth (my memory) a single set of cams and wires will do the job and a 3.5 (or was it 4) friend was most welcome towards the end of the 3rd (traverse) pitch and probably useful on P1 (the corner) as well. Also I remember coming away with the distinct impression the guide had the grades of pitches 5 and 6 well and truly arse about i.e. P6 felt 2 grades harder than P5 (more like 24 than 22 and vise versa) though they are of very different nature, 5 being a thin crimpy well protected wall while 6 had some very slick, slippery, balancey and more committing climbing. It's a great climb.
dave