Re ER's little rollover, there was a bit more to it!
The Noggy crew had installed a hydraulic system for getting the trolley in and out of the hangar, but the control levers were something from a derrick crane and stuck up well above the platform, and there was a strong chance of them being sideswiped by an errant skid during landing. We badgered the skipper for ages to lower them for safety, but he advised that he would put a guard on them instead. I toddled off on leave, and came back to the result
The guard turned out to be a half inch diameter steel tube bent over the top of the levers, which neatly caught the heel of the 212 skid with inevitable results
One other result was the issue of getting occupants out of a 212 on its side, as mentioned by AS332. The modification to paint the legs of the pax seats as a ladder was a direct result, encouraging trapped pax to use them to climb out; not that it helped in the front, where the 'top' door was/is impossible to push open from inside unless you are a 7' giant with a reach of another 5 feet!!
I thought it was the Nordraug, not the Wildcat? We also got massive firefighting monitors on the helideck as the previous hose points wouldn't reach, ISTR.