I had to attend Southampton Hospital recently for treatment, and the HLS there is right in the middle of one of the car parks - the pad is marked 14,6t, and cars are parked right under the perimeter net !
Before that it was actually the consultants' car park. I landed there and a colleague gave me a consultant parking permit to put in the cab!
The NHS has historically had little interest in and even less knowledge about landing pads. In the past the issues have been location and difficulties with patient transfer - distance, slopes etc etc. As larger aircraft become more common on HEMS this incident may be a wake up call to also review safety