Mmm, just stumbled upon this page out of a 1934 issue of the MG Magazine ... Still seems a bit late to be covering the third and fourth pics, so this may well have been a third occassion ...
The following text is extracted from "History of the MG Car Club: Part 4" on the NAMGAR North American MGA Register website, and appears together with the 1934 Shelsley Walsh photo. link below.
November 1934: In September the Club's Shelsley Rally and Rushmere Hill Climb was held. For the rally a total entry of 38 was received with converging routes on Shelsley for the Main Club, Scottish, Manchester, Midland and Northern Centres. On the day following the Rally, the Club's Rushmere Hill Climb took place near Bridgenorth over a motorcycle switch back trials course. Cars ran in pairs over the 350 yards course, which defeated a number of drivers.