Thanks Dave Reid, these figures should really be put to the main newspapers to ask Alex Cruz for an explanation. The full house by Virgin is particularly notable as their Heathrow operations are wholly based there as well.
As I understand it, de-icing is the responsibility of the handling agent, which includes provision of the personnel, kit and the fluid. There's no centralised deicing pad at Heathrow.
BA self-handle, presumably most of the others are handled by agents.