Chronograph Villa was of course for hand timing only. Again referring to Tony Hutchings' book, on the Outer Circuit, where one would assume Fernihough would be doing any testing, the Railway Straight Finishing Line timing box was the normal location for the Le Roy light-beam apparatus. However, it 'could be positioned anywhere around the track, with cables connecting it to the timing box [but] it is not known whether this system was also connected to the other timing boxes, such as the box beside the Finishing Straight, or for that matter, Chronograph Villa.'
There is also mention of another system - described as made by Leroy-Brillie - which was loaned to the BRDC by the Road Racing Club for the 1937 '500'. Hutchings has no information on whether it was used on any other occasion. It appears to have been installed somewhere on the Railway Straight.
And just for completeness, the Test Hill Hairpin below the Motor Bridge was apparently also known as Dunlops Delight (no idea why!) Seems an unlikely timing point though.