I have a 61 plate Ford Focus mk3 and I've noticed there's a hell of alot of water in the boot where the spare wheel is kept?

The rear passenger side floor is also soaking wet so I don't know if these are connected or not.

Hopefully someone's has experienced this before and can give me a clue to what it is.

The seal must be leaking or someone put a water hose in there just to mess with you.

Troubles!

Door or boot/trunk seals suspect. As it the rear window seal. Check the drain holes in the doors are clear too. One way to check is to get into the boot with a torch and get a friend to play a garden hose on all possible entry points.