I was browsing the famousfour website and found this:

https://www.famousfour.co.uk/new_parts/ff_part?part=6475



Are they mad? £66 not including the postage for a filter that will make no difference to the car which hasn't got anything to do with the word performance. You can almost service the entire car for the price of this filter.

Some can be conned into think it will though. Bloody ridiculous.