I had the same problem a lot of the online suppliers didn’t know if there manure was organic or were it came from as they resell on from large producers luckily for me a was close to a company I found online Mr Watmore’s I spoke to a gentlemen on the phone which he assured me they have a full traceable record of were there manure comes from which they source from local farms he offered me to come to there processing facilities in Cheshire, which I later did and after my visit I placed my order there and then.
They had a very impressive busy setup with mounds of soils, compost , Manures and sands were it is all Grady with large machines and then later bagged with a fully robotic bagging system bagging lots of different soil, manure and compost blends.
I have had 2 orders off them now and both occasions have been great: