A very special edition of the programme to mark its 1,000th episode. Exceptional past contestants have been invited back, and hosts Alexander Armstrong and Richard Osman have swapped roles, with Richard as host and Alexander behind the desk.

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Alexander Armstrong is joined by co-host Gabby Logan for the brainy quiz where the contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

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The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

No description available

No description available

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

Alexander Armstrong is joined by co-host Gabby Logan for the brainy quiz where the contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

No description available

No description available

No description available

No description available

No description available

No description available

No description available

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Hugh Dennis. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.

The brainy quiz returns - but this time host Alexander Armstrong is joined by co-host Gabby Logan. As always, contestants try to score as few points as possible by plumbing the depths of their general knowledge to come up with the answers no-one else could think of.