BREEAM AP/Sustainability champion appointment timing

It is acceptable for a BREEAM AP to be appointed in the early stages of RIBA Stage C/ RIBA Stage 2, if it can be demonstrated that the AP was appointed at the earliest appropriate time in the project and that the late involvement willΒ not have a detrimental effect on theΒ setting of BREEAM performance targets that need to be formally agreed no later than RIBA Stage 2.