Only in 1954 if you had the lucky ticket, but not a bad deal and all in aid of the Anti-TB Association as promoted in this advertisement from the magazine Woman, dated 12 April, 1954.
Was it this association or a Government department that ran the TB X-ray vans? As I remember they were a mobile X-ray unit in a truck, not a caravan. I think I only had one test before they did away with the scheme, maybe in the late 60s.
George