This purifier has only been used a couple of times and the filter should last around 6 months before you need to buy a new one.
Replacement filters can be bought here: https://www.amazon.co.uk/gp/product/B0B9RLH1XJ?smid=A1E5YBRJLNXVM&psc=1
Collection only.
Air Purifier (Farnley LS12)
This offer has been gifted to someone and is no longer available.