Betfair, the internet betting exchange, has unveiled the world's biggest ever advertisement to mark the final stages of the 2008 UEFA European Football Championship.

Fans flying to Vienna International Airport will see the advert - which covers an area of 436,000sq.ft, or more than 50 football pitches - in the fields below.

It is made up of many different kinds of plants that display the message ‘No 1 for football…and still growing.’

The advert took more than four months to install and cultivate, and has already been confirmed as the biggest in the world by the Guinness Book of Records.