The 5 best shows on TV tonight: Tuesday 18 May

The first semi-final of the Eurovision Song Contest airs tonight ahead of the main event on Saturday in Rotterdam.

There are 16 acts competing for a place, but only 10 of them will make it through.

For a more subdued affair, David Olusoga fronts new documentary series into the scientific advancements that have led to the lengthening of the average human lifespan.

Read more: Nick Knowles breaches BBC advertising rules

Also, Martin Lewis brings his Money Show back for a summer special.

Eurovision Song Contest 2021 - 8pm - BBC Four

It's the first semi-final today as sixteen acts vie for a place in Saturday's main show.

Russia, Ireland, and Malta are among the countries hoping to make it to the final with their chosen act.

Commentating is Scott Mills and Chelsea Grimes, while Sara Cox steps in to replace an ill Rylan Clark-Neal.

The Martin Lewis Money Show: Live - 8pm - ITV

The money saving expert and co-host Angellica Bell return for a special episode all about summer holidays.

Read more: Zoe Ball steps down from It Takes Two

They look at getaways both home and away following the lifting of certain restrictions on holidays for those based in the UK.

Hospital - 9pm - BBC Two

As more people visit their GP when the pandemic dies down in the UK, there's a goring backlog of suspected cancer patients in the gynaecological oncology department at University Hospital Coventry.

Surgeon Smruta Shanbhag and her team are under pressure to find diagnostic and theatre space in the hospital as they aim to see patients in two weeks.

The Money Maker - 9pm - Channel 4

Hoping to help out another business in need of a bit of guidance, Eric Collins heads to Birmingham.

Read more: Naomi Campbell reveals she's now a mother

He visits Winny's Meals, and while it has grown quickly he finds there are serious problems with their books.

Extra Life: A Short History of Living Longer - 10.05pm - BBC Four

Historian David Olusoga and science writer Steven Johnson front a new series exploring the scientific and medical breakthroughs that combated some of the world's deadliest diseases.

Each episode looks at one aspect of public health that had played a key role in extending human life expectancy, with its opening episode very aptly investigating vaccines.

Watch: Australia to perform in Eurovision from home due to COVID restrictions