The Energy Performance of Buildings (England and Wales) Regulations 2012

4.  For data from which a display energy certificate may be produced—

(a) a small data pack means a set of data containing the following information concerning the property in question: the address (including the postcode), the energy rating, the proportion of Co2 emissions attributable to electricity used in the property, the proportion of Co2 emissions from energy used to heat the property, the proportion of Co2 emissions from energy from renewable sources (if any) used in the property, the property type, the inspection date, the region, local authority area, constituency and county where it is located and the date the data was entered onto the register;

(b) a medium data pack means a set of data containing the data described in paragraph 4(a), together with the following additional information concerning the property: the benchmark against other new build or existing properties as appropriate, whether the property is a level 3, 4 or 5 building, the main heating fuel, the other fuel description, whether the building is air-conditioned, whether the building has specialised energy requirements, the energy from renewable sources (if any) used in the property, the floor area and the building level; and

(c) a large data pack means a set of data containing the data described in paragraphs 4(a) and (b) together with any additional data entered onto the register pursuant to regulation 27 from which a display energy certificate (or any information contained within such a certificate) may be produced in relation to the property in question.