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Just to follow this up.
Seems the manure was clean after all. Some of the asparagus ferns were broken off in violent winds in late July/ early August and regrowth has occurred since, so the sick look the plants were displaying must have been something else: extreme heat wave, ferns rubbing constantly together in the breeze etc.
What was confusing was the terrible growth of my first early potatoes which had been earthed up with the same compost; 90% of the seed spuds kicked out early growth and then shrivelled up and died off, as if poisoned.
I suppose a test would confirm it for anyone with doubts about their compost source, though my beans never came up in the intense heat of the greenhouse! Apparently a small amount of soil is best mixed in with the test compost which stimulates any potential poison therein. Cheers.