Teams from all over the UK will face Kirsty Lang's cryptic questions across the series, with Kirsty offering support and the odd hint where it might be needed.
The fourth match in the series is between Scotland and Wales.
As always, they'll drop points every time they need a clue from the chair to steer them towards the right solution.
You can follow the questions in each edition on the Round Britain Quiz webpages.
Teams: Scotland - Val McDermid and Alan McCredie Wales: Cariad Lloyd and Myfanwy Alexander.
Host: Kirsty Lang Recorded by: Phil Booth Sound Design: Chris Maclean Production Coordinator: Caroline Barlow Producer: Carl Cooper
A BBC Studios Production
Questions set by Lucy Porter, Martin Mor, and by you, the listeners!
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