Excepting the bribes inducements paid to NHS Trusts by chain retailers to allow them to trade on site.
That wording seems to suggest something at best underhand and at worst criminal is behind WH Smith's presence in hospitals and I don't believe that is the case for one moment. I'm sure the contracts will have been let in a proper manner, and WHS are just willing to pay the most. The mistake is for the Trusts not to specify that Holby Hospital WHS must sell stuff at the same price as Holby City Centre store. I expect they would find the rent they are offered would be somewhat lower though, which is why it hasn't happened in the past (but I can imagine it could in future).
Still, at least in Wales the hospital car parks are all free these days, so that's one step forward.