This paragraph applies where there is insufficient evidence of the biodiversity value of an onsite habitat immediately before the carrying on of the activities referred to in paragraph 6 or 6A.

The biodiversity value of the onsite habitat immediately before the carrying on of the activities referred to in paragraph 6 or 6A is to be taken to be the highest biodiversity value of the onsite habitat which is reasonably supported by any available evidence relating to the onsite habitat.