For 40 years, a special British institution tried to find a cure for the common cold.

The Common Cold Unit in Salisbury relied on thousands of volunteers willing to be infected with a cold virus.

Given food, accommodation and some pocket money, many regarded it as a holiday and came back year after year.

Witness History spoke to eminent virologist, Prof Nigel Dimmock, who worked at the Common Cold Unit in the 1960s.

Witness History: The stories of our times told by the people who were there.