When was the last time you felt lonely. Really lonely.

What did you do? Check Facebook? Scroll through Instagram? Turn on the TV?

Text some friends?

How long did your loneliness last? Half an hour? An hour? An afternoon.

More than half a million people in the UK go for a week or more without talking to anyone.

Campaign to End Loneliness believes that nobody who wants company should be without it.  It wants to make sure that people most at risk of loneliness are reached and supported, services and activities are more effective at addressing loneliness and a wider range of loneliness services and activities are developed.

To make that happen it had to make people aware of what real loneliness is like and help end the stigma surrounding it.

So London creative agency, BMB, set up an experiment forcing one man to endure complete loneliness for a week. No friends. No phone. No wifi. No TV. No contact.

The agency created a video diary of his time that shows his struggle with solitude. Then it sent him next door to meet his neighbour, a retired journalist who has written extensively on the subject since his wife died.

The video then documents their discussion about the personal experiences of loneliness and ways to combat the issue.

The online film is part of a wider project to get people to deal with loneliness in older age, working with partners across the UK to motivate thousands of people to take action in their communities, workplaces, and businesses.