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The man with the UK's smallest penis has been hired by a blood testing company to front their campaign telling people "there's nothing wrong with a little prick".

Ant Smith, author of 'The Small Penis Bible', is helping spread the message that people can use home blood kits to keep a track on their health with just a little prick.

Billboards around London show the author, known for his 3.5inch manhood which he named 'Shorty', brandishing a picket sign encouraging the general public to check their blood.

The campaign was today unveiled by blood-testing company Thriva, the world's first preventative health service that allows people to proactively conduct blood tests and send them for analysis from the comfort of their own home.

(Image: Solent News & Photo Agency)

Mr Smith, 50, said: "This campaign with Thriva is the perfect way to spread the word about preventative health - good mental health and good physical health, what's on the inside of the body, not just the outside.

"While playful, it's a serious message, we will all be better off if we properly monitor what's happening inside our bodies that we perhaps can't see in the mirror.

"It's something some people are scared of addressing, even if all it takes is a small prick."

(Image: ITV) (Image: ITV)

With a finger prick blood test, Thriva allows you to examine key health risks that affect millions of people.

The tests measure and track cholesterol, liver function, iron and vitamin deficiencies over time. Each test is analysed by CPA-accredited labs, with a full report produced by a GP.

(Image: Solent News & Photo Agency)

Thriva Founder and CEO Hamish Grierson said: "Thriva is at the start of a true revolution in the way people think about and manage their health.

"We're driven to make it as convenient and affordable as possible to keep a regular check on your health."