I've received a most interesting message from Mr William Whitbread, who now lives in the country house where HHS was evacuated during the Second World War!
The house is known a Witherdon Manor, Germansweek, Beaworthy in Devon.
Here are some anecdotal notes by Dr Geoffrey Glover, who was at HHS during that time!
(Please accept my apologies for the poor presentation, my IT skills were not functioning well - if a) I have any such skills anyway, and b) I resorted to the basic copy kit on an ageing PC...)!