Within Compliance Note CN4.1 reference is made to the appropriate industry standard for schools being Building Bulletin 101, Ventialtion of school buildings (2014).
On the Government website where this bulletin can be found (https://www.gov.uk/government/publications/building-bulletin-101-ventilation-for-school-buildings) it is stated the latest version of the bulletin was published in 2014. However, upon downloading the bulletin, the cover page and version control of the document states Version 1.4- 5th July 2006.
We are unaware of any other version of Building Bulletin 101 currently in use. As such, provided the bulletin is downloaded from the official Government website as detailed above, it can be considered the correct version of the bulletin for use within BREEAM.
If the thermal modelling specialist recommends an alternative standard, for example TM52, then this would be acceptable provided there is a full justification.