Of course it "could". The helipad must be approved by the CAA for commercial use as commercial (ie non military) helos operate from it.
But commercial non medical use would never be allowed by our far-sighted local authority planning departments.
Not sure that a hospital pad is really appropriate for general use though there is undoubtably a considerable need for such a facility in London. And what better way to keep the noise up high and less noticeable?