As far as I am aware it was a similar story of 'not worth the effort' but they did dust it off. Most training was aimed at the fast roping. But if the wheel comes off the gear will not be fitted anyway so they will simply deliver the 'troops' to a rooftop from a low hover from whichever 145 is in the air.
They say people should check out and learn from times past....but they do not .... put it in the store is exactly what happened with the winch they fitted to the Bell 222 on delivery in 1980 - that saw even less attempts at training.
As with the Jet Pack, gear that is in the wrong place at the time of need simply does not get used. The best rescue the Met ever did in the 222 was rescuing a worker from the roof of a burning power station in April 1992. No equipment, no training, they opened the door from a low hover and invited the gent to step inside where it was cooler.
No mean feat from a helicopter that notoriously was unable to hover!