Celebrity Painting Challenge, BBC1, 8pm

MARIELLA Frostrup presents the final, in which the best three contestants put everything they have learned into practice. First, they must capture the sensuality and movement of the Argentine tango on canvas, as performed by former Strictly Come Dancing professionals Flavia Cacace and Vincent Simone. They paint through the night at the Natural History Museum and a charity auction is held where all six contestants put their favourite artworks up for sale.

Happy Birthday OU: 50 Years of the Open University, BBC4, 9pm

THE Open University is the largest academic institution in the UK and a world leader in flexible distance learning. Since it was founded in 1969, it has taught more than two million individuals and has almost 250,000 current undergraduates. Alumnae include Sir Lenny Henry who graduated with a BA Hons in English Literature in 2007. Here the comedian and actor tells the story of the groundbreaking institution.

Jill Dando: The 20 Year Mystery, STV, 9pm

THE BBC broadcast The Murder of Jill Dando, a documentary examining the death of the Crimewatch and Holiday presenter, a couple of weeks ago. Now, on the 20th anniversary of the crime, ITV delves into the case. The major difference is that it has secured an interview with Barry George, the man wrongly imprisoned for Dando’s murder. Presenter Julie Etchingham also looks at hundreds of documents and photos and the theories and leads connected to the case.

Ambulance, BBC1, 9pm

THIS moving and eye-opening programme, which has delivered an unflinching but humane insight into the frontline of emergency care in the UK, is back for a fifth series in which it will expand on its previous remit by covering the work of ambulance crews across the north-west of England, introducing a new set of faces from Merseyside in the process. Expect uplifting stories counterbalanced by those that are genuinely moving

and tragic.