In November 2020 I installed a "Yuasa YBX5019 silver high performance car battery 12V 100AH HSB019" which fits the battery tray and still allows the battery top clamp and cover to fit over it. The five year warranty is pretty good too.
It is marginally longer and taller than the Bosch S5010 85AH but for an extra £7.50 you gain an extra 15AH which makes quite a difference if you use the radio etc without the engine running - even in the -10°C temperatures we had earlier this year it spun the engine over without a problem.
The cheapest supplier of reliable premium batteries I have found so far is Tayna Batteries - they usually arrive next day.
The Yuasa YBX5019 battery has gone up £10 in price since I bought mine and is now £99.99 + £9.48 delivery
https://www.tayna.co.uk/car-batteries/yuasa/ybx5019/
The Bosch S5010 at £93.95 + £8.01 delivery
https://www.tayna.co.uk/car-batteries/bosch/s5010/
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The saddest moment is when the one who gave you the best memories....becomes a MEMORY
V70 SE 2004 2.3L T5 Geartronic, C70 2005 2.0T Automatic, Sold 2.4l 20 Valve Automatic Torslander Sold 854 GLT 20v Auto