If it has had rigorous servicing (10k or less, without fail), then you almost certainly don't need to worry about the cam follower. Mine was as new at 60k under those conditions. 2 years would only be necessary if you were remapped.
I would very much second the corrosion - and in particular the boot floor. I spent a few weekends under mine at it's 10th birthday, scraping surface rust, and doing the whole rust-remover, rust-killer, epoxy-paint, stone guard, underseal routine. Most of the car was OK, but that boot floor was covered in surface rust. Took 3 goes with the rust remover gel and wire brush to get close enough to clean to use the rust converter. Mk5s are going to get very rare in the next 5 years.
