As a deal still too expensive, I've bought them from screwfix for 2£ and some pennies a few months ago
Compare youself. (y) https://lygte-info.dk/review/batteries2012/CommonAAcomparator.php
I've got about 8 different brands and these are the best of all. Varta is specialised in batteries, this is what they do, they have a long history. This is a great price!
I've always used these guys over the years for good, long lasting rechargeable's. Saying that, I can't vouch for these particular ones but they seem spot on, value-wise. Slightly less power than the Varta of course. Regarding the Screwfix ones - I'd hate paying more for postage than the item cost so I'd rule them out anyway. Good price if you can collect from a store however. https://www.7dayshop.com/products/aa-rechargeable-batteries-nimh-performance-with-long-life-pre-charged-2000mah-capacity-4-pack-gsy-001 2000mAh - Pre-charged AA - £5.49 including delivery. I've purchased many of their "own brand" batteries and then some Lidl ones. The Lidl's are slowly dying out one-by-one but the 7-day ones are as good as gold - after years and years of use. The best batteries I have EVER owned - bar none. I am now absolutely GUTTED that they no longer seem to do their own brand ones anymore... ;(
https://www.ebay.co.uk/itm/173573346383 a pound cheaper on ebay