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For the christmas edition of the programme, Roy Jenkins looks at the enduring appeal of the traditional carol service.

Attendances at other times of year may be down but carol services appear to be growing in popularity - and not only in churches and chapels.

What’s behind their enduring appeal? Why do people turn up and sing their hearts out? And how much does faith play a part?

Taking part in the programme are:

St Fagan's Museum of Welsh Life
Bargoed Salvation Army Band
Graham Kendrick
The Clink Restaurant, Cardiff and Ebeneser Chapel, Cardiff
The Dean of Brecon
160th (Welsh) Brigade
Victory Church, Cwmbran