The deal, quickly
This is Fairy Original, the big 1450ml bottle, available through Amazon's Subscribe & Save scheme. With the applied voucher it comes in well under £3. The community heat on this one is real, nearly 800 degrees on HotUKDeals, which for something as unglamorous as washing up liquid is actually a lot.
Who this is genuinely for
Look, if you already use Fairy regularly, this is a no-brainer. It's the green original, not some fancy variant, and that bottle size will last you ages. I got through a 625ml in about six weeks doing dishes for two people. At that rate, a 1450ml at this price works out properly cheap per wash.
If you're a household of one who barely cooks, maybe skip it. The bottle is big and Fairy does eventually lose a bit of its grease-cutting punch once opened for months on end. Small detail but worth knowing.
The Subscribe & Save caveat
This is where I'd just ask you to pay attention. S&S means you're signing up to receive it regularly. Amazon makes it easy enough to cancel or skip deliveries, but you do have to remember to do that if you don't want another one landing on your doorstep. Set a calendar reminder, mate. It takes thirty seconds and saves the faff.
Honestly though, at this price point, Fairy Original this size is hard to argue with. Spot on for families or anyone who actually cooks.