Looking at the modern OS map, and historical maps, this 1933 newspaper report on a North Warwickshire foxhunt is entirely consistent with Bostock's Fernhill being the easterly farm at that time:
"The fox crossed Warrior's Lodge farm into Kenilworth Chase and, leaving this covert, ran down to the Castle walls and alongside the Kenilworth (Inchford) Brook and right-handed away from the town back towards Honiley Hall, where the fox was viewed a short distance in front of the pack. Here he led hounds over Mr Bostock's Fernhill Farm, near the Kennels [HQ of the hunt at that time], and the Rouncil Farm and lane with Banner Hill to the right, and ran on to Goodrest, near Woodcote...”
The use of “Bostock’s Fernhill Farm” may be to differentiate it from the other Fernhill Farm, presumably Stanyer’s.