Going back to Gary's original picture, the little black car, no 22, is the mk1 DRW driven by Mike Wilds identified, apart from other features, by the cranked roll over hoop. I suspect it is after the late Spring rebuild in 1966 as the front wings barely cover the wheeltop, whereas prior to that they were more like those on the yellow device ahead of him. I believe it is mid to late 1966 because by the start of the 67 season Mike had changed to the new F1200 spec, with 1198cc Anglia/Cortina engines replacing the old 1172sv units, at which point the car had been repainted white with a red stripe and nose band.
I cannot be more specific about the date, since, despite having a very large database of DRW entries and results I do not have a Brands entry for that summer with the number 22 for Mike, nor have I come across any mention in period MNews or Autosport. Perhaps Pete Stenning or Sterling, or A N Other on TNF might have something I have missed in their Brands programme archives. All DRW entries more than welcome, Better twice than to miss any.
I have already had access to the postcard from another DRW-ist with vested interest who came across it in a shop in the 1980s.
Gary, if you are looking for a home for the postcard please contact me.
Looking at the track position I believe it is at the end of what we used to call Bottom Straight leading into Kidney Bend for access to the club circuit link to Clearways, but first doing the left hand South bank Bend, given near-legend status as the regular site of Jim Clark and his Lotus Cortina on 3 wheels as he set the car up to go up the rise onto the full GP Circuit. Halcyon days....
Roger Lund