The Clueless icon plays an aggressive lawyer in sinister series Irish Blood. Plus: Ant and Dec’s ridiculous new challenge show. Here’s what to watch this evening

9pm, Sky Witness

From Judi Dench’s very naughty tea with Kenneth Branagh to the Peep Show Bake Off special – including Olivia Colman! – here’s your definitive guide to the best holiday viewing. Bring it on

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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