Just come back from harrassing innocent members of the public and the findings are as follows:
OAT +2, 135ft AMSL, wind 040/09, 2795Kg gross weight
4ft hover, without Cat A 58% Tq, with Cat A - 58% Tq
No discernable difference, Tq initially climbs when Cat A selected, but when everything has settled down, same figures on the VEMD. I didn't take the figures for N1 & TOT as they are not a limiting parameter.
Open to suggestions