A street artist is creating a graffiti image based on products from Greggs’ new sandwich range on a billboard in Old Street, London.

The artist, named Hammo, will be in action each day this week, commencing 11 August.

The event has been developed to mark the official launch of Greggs’ range of sandwiches, including its new under-400 calorie Balance Choice.

The new range of more than 30 sandwiches includes a variety of freshly developed flatbreads, baguettes, sub-rolls and rustics with a variety of fillings.

Visitors to the billboard will be encouraged to guess which sandwich is being created each day, entering their vote via Twitter, for a chance to win a range of prizes.

The ‘Fresh Billboard’ can be found at 276 Old Street/Great Eastern Street, London EC2A 3DQ or online at www.greggs.co.uk/freshbillboard.