Perhaps I may have misremembered with Granada Rentals. No need for the Hmm's and the snide inuendo.
I checked with my brother and he too thought the same, so a genuine error (he did recall the TV was made by Ultra).
Wikipedia "The company (Granada) also established a chain of television rental shops from
1959 onwards, expanding in 1968 by purchasing Robinson Rentals for £8 million from
David Robinson.<a
I also remember attending a street party in 1953 for the queen's coronation. You can Google that if you wish.