The Truth About Obesity is on BBC One at 8pm.

This documentary seeks out the latest research into the medical condition, finding out what it means to be obese, and looking at the most up-to-date solutions.

Paul O’Grady, for the Love of Dogs is on ITV at 8.30pm.

The comedian travels to India to meet people who are dedicating their lives to helping abandoned dogs in Delhi.

Ambulance is on BBC One at 9pm.

Return of the documentary series following the work of the West Midlands Ambulance Service. A day shift take an unexpected turn for one paramedic, when a Nine Nine Nine call becomes personal.

Harold Shipman, Doctor Death is on ITV at 9pm.

This one-off documentary tells the story of Britain’s most prolific serial killer, shown to mark 20 years since his arrest.

Our Housing Crisis, Who’s to Blame is on Channel 5 at 10pm.

Former Tory MP Michael Portillo investigates the story of Britain’s social-housing revolution, as he traces the rise and fall of the council estate.

Arsenal versus Atletico Madrid is on BT Sport 2 at 7.30pm.

Coverage of tonight’s Europa League semi-final, first-leg match at the Emirates Stadium. Kick-off is at 8.05pm.

Celebrity Juice is on ITV2 at 10pm.

Host Keith Lemon welcomes musician John Newman, and TV hosts Stacey Solomon and Joe Swash.