Given that Trump got elected despite a rape conviction and the revelations of being at best grossly negligent with national secrets (and quite plausibly giving them to the US’s enemies), the downside to Russia is that whatever kompromat they have on him is of no use, as the public won’t care.
Given how threadbare the NHS is after over a decade of underinvestment and privatisation by stealth, I doubt he or any C-suite officer would ever set foot in a NHS clinic.