Tonight's UK television listings highlight a new three-part Sky Arts documentary series, Voices of the Valleys, which follows Welsh male voice choirs as they prepare for competitions across the country while exploring their deep community significance. The series opens with the Beaufort Male Choir, featuring tenor and soloist Callum Rees, who puts his busking earnings towards supporting the group.

Elsewhere in the schedule, Channel 5 offers two documentary strands: Casualty 24/7 follows staff at Barnsley A&E, while 999: Critical Condition visits Birmingham's Queen Elizabeth hospital, including a pensioner undergoing surgery for an inner ear tumour. Channel 4's cyber thriller The Undeclared War nears its finale, BBC Three brings back Guy Montgomery's spelling gameshow with returning champion Tom Walker, and BBC Two examines the case of a disgraced undertaker in The Big Cases, alongside live coverage of The Hundred cricket.