The poster bears the TA’s slogan "Do more. Be more", which was displayed at the top of mount Corn Du, the second highest peak in the Welsh mountain range.

Advertising company Clear Channel approached Prismaflex UK to make a special prototype poster that could withstand the extreme weather conditions to raise awareness for the TA's recruitment campaign.

The TA used pure manpower to mount the poster, frame and lighting equipment, which weighed a total of 3.5 tonnes, on the mountain top.

The poster was shipped to the peak in one piece and assembled with the apparatus atop the mountain.

Prismaflex UK, based in New Haven, East Sussex, printed the 12m x 3m mesh on its QS3200r printer using full colour QSR UV ink, despite the image being in monochrome.

The stormy weather meant that it took two attempts to display the poster, as at first the peak was deemed unsafe for climbers. However, the second attempt saw the slogan lit up on top of the mountain range to promote TA recruitment.

Prismaflex UK managing director Tom Weaver said: "This was clearly a big test for the TA but also for us. We knew our posters worked on the high street but we'd never tried to put one up on a windswept mountain before."

"I was amazed at the skill and commitment shown by the TA team. Their motto really is 'nothing is impossible.' I was pleased and relieved that we didn’t let them down."

Prismaflex UK is a wide format printer, formerly known as Urban Storm until it was bought by Prismaflex International in early 2012.