Seems a perfectly readonable question to ask of peoples experiences on this subject, it can be a bit of a minefield. As said though, wim are not the sort of company to charge twice to do one job. If there is an issue they do sometimes look for broken springs fubar bushes and loose steering idler, but not always, they do pile in on occassion.
So, to be safe, and as with any owner paying for set up, it is always wise where possible, to check the car over first. Springs, wishbones, steerig idler, track rod ends, wheel barings, rear bushes....as changing any of these can/will affect the set up meaning set up again, waisting the owners money and time of both partys.
HTH