See here and here for a response by the Treasury to a letter sent by Charlotte Leslie MP. Note that
+ The Treasury states that they do not consider sustainability in their assessment and due diligence under the Guarantee Scheme, i.e when deciding to which projects they’ll give public loan guarantees
+ The Treasury refers to biomass sustainability standards which apply to subsidies – but those don’t actually exist. They have been proposed by DECC since 2010 but have been delayed twice so far, currently to April 2015, but with no guarantee that any standards will be introduced then. The proposals have been condemned as wholly inadequate by NGOs.