Water is leaking into the footwells of my car - what's causing it?

My Jeep Cherokee has started filling up with water in the driver's side footwell - the front and especially the rear but only when it rains. A mechanic has done hose test and can't find anything. He says...

4x4 suggestions?

My pregnant daughter is moving with her husband to the Peak District a is looking to buy a Jeep Cherokee or Audi Q5 - she wants the Cherokee her husband wants her to try the Audi Q5. She will be travelling...