I had a series 3 and apart from water on the inside sills (presumably from the door seals) it was pretty water tight, a micro fibre cloth inside with me to wipe the water up before getting out solved the problem.....oh and when you wound the windows down in rain it poured in from the roof, again the micro fibre held up against the roof sorted that out....oh and I forgot, wipe the boot with the microfibre in rain prior to opening it or the water from the boot lid runs straight into the boot, you'd be surprised how much water the boot lid holds!!!
