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“They shot a lot in my kids’ school holidays, so they came out for a month, which was great. And the rest of the time I commuted. It would be a week shooting and then I would just come back and then go back out a few weeks later.”

Laz, who is single-minded in her mission to reach Mars, was a complex character for McElhone to get her teeth into. It’s obvious from the first episode just how driven she is. But she also comes across as rather cold, as she doesn’t have the best interpersonal skills.

“She is quite inscrutable on some level

best value for money so that they can put the cash they’ve saved towards Christmas. Alexis Conran compares ice-cream from fast-food chains, while Smart Shoppers Kelly, Jo and Leisa are in Lincolnshire for another supermarket dash to slash a family’s weekly food bill. Plus, as the Christmas countdown continues, Andy Webb checks out more high-street deals.

Prince, Son and Heir: Charles at 70 (BBC1, 9pm)

On November 14, Prince Charles will turn 70, and the BBC is starting the birthday celebrations early as it brings us this documentary. Over the course of 12 months, filmmaker John Bridcut has had exclusive access to the royal, observing him at work and

Natascha McElhone as Laz Ingram, with Sean Penn as Tom Hagerty and Oded Fehr as Eitan Hafri, in The First