What is thought to be Britain's oldest working television has been tracked down in a house in North London.

The 1936 Marconiphone, thought to have been made in the months that Britain's first "high-definition" television service began, was tracked down after a competition.

The set belongs to Jeffrey Borinsky, an electrical engineer and collector of antique television and radio sets. Despite its age, it can show modern TV channels broadcast on Freeview.

Digital UK, the body overseeing the switch to digital television found the set. The aim was to publicise the message that just about any television, however old, can be used to show digital channels.

Rory Cellan-Jones met Jeffrey Borinsky to find out how the set still works after more than 70 years.