Virgin Hems do in fact own G-EHMS. I remember as Bolkow said above, in the early days, if they could have dropped kicked that 902 off the Helipad, they would have done. Serviceability of about 70% !! But I guess it was a newish type at the time and better supplies and service from MD Helicopters have made it 'fit for purpose'.
I imagine now they would be as well continuing with the 902. Can't see them forking out for a new machine in todays economic climate, and not sure there would be many aircraft suited for the role as a 902. I feel the 135 is just a bit small for the sort of Urban operation that HEMS is.