UK & EU law places the legal liability on the retailer not the manufacturer. You will be able to return long after our US friends have been told it's outside the return window.
Unfortunately UK seems to have accepted Amazon marketplace as platform rather than Amazon as retailer. "Sold by Amazon" should keep you within Sale of Goods Acts protection. Guardian have been running a few tests recently[0],[1].
Traditional large high street retailers will typically avoid this by checking you conform to safety standards and are genuine, before accepting you as a supplier. Then randomly checking until you eventually rate becoming a preferred or trusted supplier. So I have high trust of everywhere on the high street, even including Poundland.
[0] https://www.theguardian.com/technology/2018/apr/27/amazon-si... [1] https://www.theguardian.com/technology/2018/jun/06/dangerous...
I ask because I recently started using Amazon since I moved to the UK and it's been fantastic. I haven't ran into any of these problems.