xmlns:atom="http://www.w3.org/2005/Atom"
20. In regulations 38(2), 39(2) and 39A(2)(b) for the definition of C substitute—
“C is—
the heat in kWhth delivered in the relevant quarterly period to the biogas production plant which produced the biogas which is combusted (other than heat contained in any feedstock used to produce that biogas); or
where—
x is the heat produced by that biogas which is used for eligible purposes, and
y is the energy content of all the biogas produced by that biogas production plant.”.