It is a total PITA to change on our RHD cars, as space in the driver's side footwell is tight. I had a look, as I was thinking of replacing the standard filter with the HEPA filter option, but decided against it when I saw that you needed to be a contortionist to get at it. It looks as if it might be easier to access on LHD cars, as then it would be under the glovebox I guess, but on our RHD cars it's a fair bit more awkward.