Just to add more fog to the waters! It was indeed a British Relay system at our house in East Kilbride but I remember my Mum paying her TV rental at the Rediffusion shop! These must have linked together at some point.
While having a quick google on this subject I came across this which is very interesting reading in a nostalgic sort of way. A monopolies commission report from 1968 on the proposed merger of Thorn and Radio Rentals.
http://www.competition-commission.or...ext/047c01.pdf
I'm glad I read down to page 14 where I'm informed that a 19inch colour set retails for about £260-£300, a 25inch set for between £280 - £350!! Flipping heck!! No mention if that was for an HD ready set
As a proportion of earnings that was probably the equivalent of a small family hatchback car today.