Bought one from argos months ago. I'm pretty sure I paid 12-13 pounds then. I'm sure there is one better qualify out there but to my family, it's decent enough. Very good price.
12 Aqua Optima Evolve 60Day Water Jug Refill Filter fit BRITA MAXTRA 2 Year Pack £22.69 with code. PINCHME item number:162077242349
The White one is £8.49 delivered to store here. Use code SANTA15. https://www.robertdyas.co.uk/aqua-optima-oria-water-filter-2-8l-jug-with-1-month-starter-pack-white