As seen at Mashable:
https://mashable.com/uk/deals/kindle...ited-free-deal
Apparently Prime members in the UK can claim 3 months of free Kindle Unlimited now through October 11 if you haven't had a trial in the last 3 years. I don't actually see the Prime limitation on the offer page but that's how it was billed, so I'm keeping it.
Changing the URL to the US site gives the same offer for me, so I'm signed up again. Not sure it's been 3 years for me but I'll take it.
Hopefully, I'll get more use of KU this time. At minimum, I'm finally going to try
We are Legion (We are Bob) which has been recommended to me a lot.
Amazon UK link (w/o affiliate tags):
https://www.amazon.co.uk/kindle-dbs/hz/subscribe/ku
Amazon US link:
https://www.amazon.com/kindle-dbs/hz/subscribe/ku
For those in Canada or elsewhere where KU is offered, it might be worth changing the URL to your country's to see if it works for you too.