Not a leon, but my toledo is just short of 94k miles.
Problems:
Battery (Managed 7 years!)
Door switch doesn't work so car re-locks itself all the time
Suspension bushes (The oil leaked out of rear hydro's)
Farting Stereo
Rusted brakepipe
Aircon regas (Previous owner probably never used it)
Alternator belt and tensioner
Nothing major though!!! touch wood.
The car seems to be quite loud at the minute, but the exhaust isn't leaking. Sounds good though, running REALLY well and no fault codes, so I will leave it as is.
Would I sell it? Nope, if anyone's gonna break it, it will be me