I would assume its a proprietary size, even though it fits in a 3xAAA slot.
Don't be a tight arse... its 25 quid! Buy a Chinese Amazon-special head torch if you find 25 quid too much for a high quality and innovative torch battery.
Podcast Mountain Air - 15. Forecasting Avalanches With Mark Diggins of SAIS
News Community Group Aims to Buy Bridestones Moor
A group of conservationists hope to buy Bridestones Moor, and have launched a crowdfunding campaign to raise the money. The 144-acre moorland near Todmorden includes the popular bouldering area, and the aim of the buyout is to create a...