Butler's pantry, billiard room, housekeeper's room, lamp room, and the servants' hall
There were further buildings to the west on what is now the railway side of Wightman Road. Just above where the M and A of Wightman is on Hugh's overlay. Specifically, 3 graperies, 2 pineries, a peach house, a strawberry pit and a plant-stove. These were all heated by a couple of steam boilers, the pipes from which also serviced the greenhouse, conservatory and western end of the house.
These images are from Loudon's Encyclopaedia of Gardening 1825
I had a go at mapping these back in 2009 here.