I am sure I am the only person to have this problem, but we have recently noticed a large amount of water accumulating under the passenger side floor at the back. Does anyone have either a reason, or a cure for this??

Leaky doors! Very common and there's about 30 threads out there covering this already. Have a search.

I am sure I am the only person to have this problem, but we have recently noticed a large amount of water accumulating under the passenger side floor at the back. Does anyone have either a reason, or a cure for this??

a friend had same problem 2 skoda dealers could not cure it but it so easy to fix. in engine compartment where battery is situated, there is a drain hole. \this can get blocked, water accumulates and leaks via bad seals most likely at servo. good luck.

Welcome to Briskoda. I'm guessing that the car involved is a Fabia so have moved this thread to the Fabia forum.