Rediffusion here...Ah yes, Radio Rentals and Rumbleows.
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Gave it a google.
You could buy a kit for your own telly, fit it on the power cable, or rent one free and pay via the slot.
Over time...started at 5p for 4 hours, often ended up at 50p per four hours.
Many people paid for their first colour telly that way.
Remember the start of colour telly, C4 and C5.
Pass the Werthers Originals.