At 09:45 on Christmas eve, S4C will broadcast a Christmas edition of Oli Wyn.
In this episode, Oli Wyn and a group of year 1 and 2 pupils from Ysgol Glan Morfa in Cardiff, take a closer look at how Cardiff Council went about decorating the city centre.
The youngsters were a pleasure to film and sang beautifully outside the Castle, despite the cold!
