Simon Woodall posted this video clip on You Tube and has also contributed the following:
The featured section is Meadowley, which has been used for every Clee Hills Trial since I restarted the event back in 1980. In 1950, the start line was on the tarmac road although the current start line, which is off the tarmac road, is recognisable. JNP400 [0:30] is, of course, the works development Dellow. The lady jumping up and down towards the end is the photographer’s wife.
Simon also comments on the difference in performance between the big Allard and the small Ford 10-based cars. On re-watching the video I'm not so sure about that as it seems, to me, that there are good and bad performances from both the large-engined and small-engined cars.
There has been a suggestion that this was the H & DLCC (Hagley & District Light Car Club) Shropshire Trial, and not the Clee Hills Trial, but Simon cannot confirm either way.