Unilever has recently changed the formulation of its Persil non-biological washing powder. It's no longer ""the original non-bio"" as they falsely claim. Specifically, they've changed the perfume - about the most dangerous ingredient they could change. However, they don't tell you this on the packaging. The only indication of the change in contents is a misleadingly meaningless ""just washed feeling"" circle logo on the packet (and a slightly lower net weight for the same size of packet). This surreptitious change has already caught some people out and given them nasty itchy rashes (the cause of which took a while to work out because Persil had failed to indicate their product had changed materially).
The ingredients list is vague to the point of uselessness. So people will be unable to predict in advance whether or not they will be allergic to the new version of the product. It's very much a case of caveat emptor. The change happened some months ago so most older, safer packets of the product will have been cleared from the shelves by now. Hence it's already too late to stockpile significant amounts of the previous version in the hope Unilever can be persuaded to reverse their decision.
The main purpose of this warning is thus limited to informing people of the change which Unilever/Persil are otherwise ostensibly keeping secret and to alert Persil non-bio users to the possibility that any new symptoms they are experiencing may be the result of the change to Persil - since a significant proportion of customers may well have bought it in good faith, and be under the impression that they hadn't changed anything in their lives, without realising they are in new danger from a previously safe product.
This might also be a good place for people to suggest alternatives which they have found to be safe and build up a picture of which are the safest for the most respondants. Eg suggestions I've already received include: Surcare, Ecover and M&S fragrence-free non-bio.