Wierdest 1 Ive ever had was from the door loom plugs, were they screw onto the A pillar plug mine wasnt on all the way and water was leaking in. So would check that as it has arrows on it. Also another common 1 is front sunroof drain holes get bunged up on the ends where they come out of A pillar and as the pipe is plastic and ends are rubber there just a push rit and once the end is blocked it easily overflows into the footwells.
Just an update sunroof drain on drivers side was blocked now clear and the rubber loom boot on drivers a-post had come adrift at the top now all sorted and have dry carpets again many thanks
I unlocked sunroof drains and rear drains too. Also found perished rubber bungs on floor pan. Changed all these and my colour concept has been dry since. If problem happens again, check underneath of car for condition of floor bungs.
