I collected half a trailer load of strawy horse manure, but wasn't absolutely sure how old it was, some of it was quite dark so I assumed it would be older than 6 weeks and left that behind.
The 'stable manure' needs to be 6 weeks or less to ensure good decomposing - the fresher the better.
I had intended to only put a few barrowloads of this manure from the trailer into the polytunnel hotbed and stack the rest outside while I collected some more which was guaranteed to be less than a week old and to mix both types together, but as I filled the hotbed, it looked a good mix of straw and manure so I carried on and emptied all from the trailer into the bed.
I needed the trailer to be empty to collect some bagged manure.
I used the thick plastic bags again to line the front planks, it gave it a 'Christmassy' look!
Just have to wait now for the microorganisms to get to work and break it all down, generating heat like a hot water bottle and give me around 2 months 'underfloor heating'.
Retired, I have a 9 rod Allotment with a Greenhouse and a Polytunnel and love growing food.