Water in spare wheel well, is a know problem that is easily fixed.
Best to search on here for full information, but in summary:
Remove roof gutter trim
Dig out crumbling seam sealer right at the back
Fill in 5mm gap with polyurethane sealant (not silicone)
Use touch up paint when dry
My discs are rusty when the car has been parked out a while, but quickly clean up.
New front discs & brakes at 51k is probably fair, although you could maybe get 80k from the discs.
Can't see there being much wear on the rears
10 years from the exhaust is normal especially in warm climates.
Bit of washing up liquid on the exhaust rubbers helps get them off & on when replacing. Take a good look at the joint with the catalytic converter, the flange can rust and require effort & ingenuity when replacing the middle section. Make sure the back box is fitted to the middle with spring bolts, or an early failure and a snapped joint can occur when it starts to rust.
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TG