Greenpeace has been warned not to encourage anti-social behaviour following an advert which requested people to sponsor the painting of a chimney.

The Advertising Standards Authority (ASA) suggested that similar activity may prompt illegal incidents of damage, reports the BBC.

The advert read: "Chimneys, they're a bit dull aren't they?

"We prefer them when they have statements written down them, like 'no new coal' or 'stupid', which say what we think about them."

In reaction to the advertisement, the ASA told Greenpeace that ad should not appear on the internet again, adding that it was harmful and irresponsible because it condoned anti-social behaviour.

This news comes after the South Wales Evening Post reported that a chimney in Wales' Dulais Valley is set to benefit from a makeover in new plans.

The red brick chimney at Cefn Coed Colliery Museum will receive vital repairs now that funding for the project has been finalised.