I eventually found it online here:
Actually, took me a while to find the article online, but fortunately I had the names of the reporters in question.
It doesn't impact me in any way as I don't use Amazon anyhow.
I realise this kind of thing happens elsewhere in the world, however, I thought it an interesting article due to the following:-
1. It's happening in the UK (not some country in the East where labour laws generally favour the employer)
2. Amazon isn't exactly what I'd call a struggling business (read the article)
3. The casual workers aren't specialised (like doctors for example), so any staff shortage is artificial
Just thought it would be interesting food for thought.