Totally right people coming over here should pay to access the NHS. There definitely needs to be an exemption to this if you're working for the NHS, at the bare minimum you'd expect a hefty staff discount as common across many workplaces. The only possible issue I see with this is if someone comes to work for the NHS with the knowledge they need an expensive treatment to game the system. I would think that's pretty damn rare, maybe a limit to the expense before the need to pay kicks in to counter this possibility?