The Sweatshop staff do the best with the limited equipment they have at their disposal.
I'd forget the footbalance though. If they tell you that they "have" to do it as part of their analysis, what they mean is they are told to do it by their bosses. They have got rid of people who didn't meet their target for moulding the insoles. Save the £45 and put it towards some shoes.
And they are on a bonus for selling anything that is Karrimor. But only Karrimor. Hmmmm. I wonder why that is then??