Freelander 2 - Faults

Hi - I am new to this so please be kind. I have a 2007 Freelander 2 that has started to fill up with water under the seats and I am having to use towels to remove the water, it's definately rain water, I don't have a clue where it's coming from. Has anyone got any ideas if it's possible for the water to get into the ventilation system or is it more likely to be coming in under the windscreen and migrating downwards?
Also the driver door windows and mirror control panel has stopped working *( intermittent at first and now kaput)..

Any advice and guidance please?

Thanks