Recommendations for Energy Performance Certificate for RHI payments

throwa

Morning all.

We have just more or less completed a major rebuild / renovation on our house, and as part of this installed a solar thermal system which has just been signed off (we have the Micro Generation Certificate). We understand now we have to get a Energy Performance Certificate before we can apply for RHI - there are loads of companies offering this service online. Should we just pick the cheapest, or can anyone recommend one that they have used in this situation before?

The new bit of the house has been built exceeding building reg requirements, the old bit of the house is solid wall and externally rendered, so we want to make sure we don't get any stupid suggestions like cavity wall insulation, hence not automatically picking the cheapest online option!

Many thanks.