MINISTERS have been warned that any move to water down legislation on how buildings are heated would be “environmental vandalism.”

Scottish Green co-leader Patrick Harvie made the remarks ahead of a ministerial statement on the Heat in Buildings Bill, which would require homeowners to switch from polluting heating systems like gas boilers to greener alternatives.

But SNP Energy Secretary Gillian Martin announced a redrafting to target fuel poverty last month, sparking Green fears it may be diluted.