Biggles post at the start of this thread was made in October, as Sandra says, before the offer disappeared.
I phoned Ancestry support last week, a couple of days before my subscription expired, explained that I had obtained a worldwide sub for £89.99 last year (didn't say how) and politely asked if there was anything they could do for me this year, as in the current situation money is tight, etc. I was offered the renewal at the same price, £89.99.
The only thing was that I had to lose the remaining couple of days of my existing subscription, as they had to start the new sub there and then, via card payment over the phone, or risk me ringing back a few days later and potentially getting a less favourable response. A couple of days didn't bother me in the circumstances, but if it does bother anyone, I'd recommend waiting until the last day of your current subscription.
I did think about letting the current subscription expire before I called them, but reasoned that if I called without a current sub, they might be less inclined to make an offer?