On the wagon at the bottom where the jack sits, both sides....Infact underneath at the back behind the wheel arch, it's badly rusted (I'll get a photo), that's why there's a smell of dampness. When out earlier, when I was stopping, I was rolling back slowly to stop, when I did, I could water swirling asset the back, where would it coming in.

I'm now having doubts about the car as it might a lot of welding for the mot if it's structural and part of the chassis...this is on the non turbo I picked. If it's that bad I'll maybe end selling it and keeping the turbo and using it wisely, but I use a car daily so would be !Removed! expressive, honest to god!

Check the rear lights are tight might need to put a blob of silicone around the threads on the lights to form a water tight seal. I'm sure that's where it will be getting in from.

Ok, bit it's the damage it's maybe already did, I'll get a photo of underneath tomorrow

There is a young guy on here Rollermite who had a battery leak acid all over the back of his. And he did a great job repairing it be worth having a look at his pictures. 

Thats true check out his project he has achieved a lot with minimal outlay