Cite please.
P215 CAL refers to DI Cook arranging with a farm worker to bring a trailer round where mattresses and bloodstained carpet pieces were tipped out of an upstairs window onto a trailer and taken to a site on the farm which was used to burn general rubbish.
According to DI Cook the 1986 internal review confirmed nothing of evidential value was lost.
You never just trust me do you?

After handing Len his wages,
Jeremy asked for a small trailer, explaining that he wanted it for rubbish from the house. He backed it into the yard with the tractor, close to the door. When Jean saw him later that morning he told her to pack the rest of the silverware into a large box,
Lee, Carol Ann. The Murders at White House Farm: Jeremy Bamber and the killing of his family. The definitive investigation. (pp. 257-258). Pan Macmillan. Kindle Edition.
The trailer was still in the yard and piled high with Nevill and June’s clothes when Ann and her father called at White House Farm on Friday afternoon. Jean offered them June’s collection of commemorative biscuit tins,
Lee, Carol Ann. The Murders at White House Farm: Jeremy Bamber and the killing of his family. The definitive investigation. (p. 259). Pan Macmillan. Kindle Edition.
When Barbara and Jean arrived for work on Monday, 2 September
a narrow pall of smoke was curling up from the waste pit in the garden, where Philip Wilson had emptied the trailer as instructed.
Lee, Carol Ann. The Murders at White House Farm: Jeremy Bamber and the killing of his family. The definitive investigation. (p. 264). Pan Macmillan. Kindle Edition.