Amber, George, Balvinder and Karen battle it out for a chance at the glitterball trophy. Plus: get in the spirit with some festive bangers. Here’s what to watch this evening

6.35pm, BBC One

A documentary about the cover-up of barrister John Smyth, who subjected more than 100 boys to abuse. Plus: Ellie Taylor’s standup special. Here’s what to watch this evening

9pm, Channel 4
This devastating two-part documentary details the crimes of John Smyth, a barrister involved in conservative evangelical Christian camps. Over the course of four decades, Smyth subjected more than 100 boys to horrific sexual and physical abuse. Why wasn’t he stopped? Witnesses, including his victims and his own children, speak about life in close proximity to this monstrous man – and about the cover-up that meant he never faced justice. Phil Harrison

This deeply moving documentary celebrates the lives of the three girls who were killed in an attack on their dance class last year – and becomes a miraculously powerful tale of turning heartbreak into hope

If losing a child is the worst thing, the very worst, that can happen to you, what must it be like to lose one in a tragedy that was national headline news? Alongside that insurmountable sadness comes the question of how to reconcile grief’s normally private, quiet bearing with the fact that your bereavement was a public event. Nobody would be blamed for staying out of sight, saying no to interviewers and documentary-makers, and holding the memories close. But in Our Girls: the Southport Families, we see how a loss shared can be miraculously powerful.

Nine-year-old Alice da Silva Aguiar, seven-year-old Elsie Dot Stancombe and six-year-old Bebe King were all murdered on 29 July 2024, when a man invaded a holiday dance class in Southport, Merseyside and attacked children at random. The programme does not linger on the horror, or speak the killer’s name: instead it begins by introducing us to the girls as their parents remember them. Alice “was magic, she was wonder … the best daughter we could ask for”; Elsie “was unforgettable … she taught us how to be a mum and dad”; Bebe “was pure joy: everything was in a dance, everything was in a song”.