Posted: 04/07/2014 at 21:03
Thanks for the replies, especially the thread about Lidl's compost having the same issue. This does suggest they both use the same supplier.
Unfortunately, I've already emptied the bag in my soil and pots, though I haven't mixed it into any soil beneath it. I'm uncomfortable with this compost, now that I know it certainly shouldn't smell of Jeyes fluid (and could even be oil contamination), and I certainly will never buy from Aldi again (nor try Lidl).
I think I'll leave things as they are for now, but once the plants in the relevant areas have died down, I'll scoop it all up and replace it with J Arthur Bowers. It costs three times as much, but this appears to be one of those occasions when you get what you pay for.
What I can say after a very hot day is that my own compost (made from vegetable waste) is very dark when damp but turns silver/grey when it dried out completely. The J Arthur Bowers is a very deep brown when wet but turns a reddish brown when dry. But this particular bag of Aldi's compost was almost black when it was wet and remains almost black when bone dry after a day of hot sunshine.