Eyore
New User
I have just done some research, apparently you dont need pp as long as government guidelines are met.Without checking, almost certainly yes, and within tight environmental guidelines re run off, not contaminating watercourses etc.
It’s hard enough to get PP for a muck heap for 3 horses.
ETA
https://www.gov.uk/guidance/storing-silage-slurry-and-agricultural-fuel-oil