Not a car photo but thought this fixtures list from from the Royal Automobile Club Annual Motorsport Year Book 1973 published by my club the RAC -- the governing body of Motorsport and the FIA ASN for the UK might be useful in this thread. The list might be of interest to folks researching rallying events in the UK in 73. This excerpt shows all the rounds of the RAC Rally Championship that year culminating in the International RAC, run by the club itself. Maybe the original fixture list will help with chronology, RAC licenced local organising clubs and name of the qualifying events in their 73 championship, since these things are not always clear.
Attachment 511641
Attachment 511643
Attachment 511644
Attachment 511642
Steve