Going back over 1972 F3 races I discovered a weekend when Pryce and Brack appear [at separate races] on the same day. So Brack's car either has to be a hors-series prototype, or the RP11A which is supposedly sold to Vermuelen.
Regarding the Les Edmunds car: It could be almost any of them except chassis 2. However, where was Edmunds from because there is a persistent ad around 1976-77 in A/S for an ex Pryce RP11 with a Brighton phone number. This would be either 1 or 6 I guess.
Chris
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