Oh no that's bad luck, digeroo. I'm sticking with my usual riding stables now, I don't have problems with aminopyralid thank goodness.
If you can get some, it will still be useful, beanie3. If you have a very small amount available, give it to a 'priority plant' - a greedy plant, and one you love!
If you put well-rotted manure in sacks, it doesn't smell, and is very dry. In the end it becomes like soil. So you can probably safely put it in a car boot. But it depends on what you have access to I suppose - maybe you can only get hold of fresh manure!
Compost is great as well, so they say. I guess you have a compost heap? That will help your plants out.