Artist calls in lawyers after Tories use his Burnham portrait without consent

The bottles mocking Andy Burnham – and using Stanley Chow’s cartoon – were on view at the Conservative party conference in Birmingham. Photograph: Christopher Furlong/Getty Images

An artist is considering legal action after the Conservative party used his cartoon to mock Andy Burnham.

Stanley Chow, a Manchester-based illustrator who works for the New Yorker magazine, created a cartoon of the prime minister for campaign material in the Makerfield byelection earlier in June.