Make sure everything works and check underneath for corrosion. One I looked at still had half a small field attached to the underside.
After that I had a professional inspection done, they're a tad more complex than my old Series 2A!
I've got Britpart performance front discs on both the Defender and Freelander, with EBC pads and they've definitely been an improvement.
Edit: Paddock and LR Parts both do them.