Genuine filters - cabin / pollen, oil, air

[Readie]

Hi just picking up on this thread. Am a new owner just 1 week in and looking at a few things.

Gave the car a good clean of the leather and the inside generally at the weekend as there was a distinct whiff in the cabin. A lot better now but still a bit of a musty smell, especially if on 'eco' mode on the air con.

This has made me think that a change of the cabin filter would be a good place to start - any comments or other suggestions ?