Cambelt interval is set at Ford to 100k. However most (including I) do them at around 80k. So make sure its been done, and if it hasnt then use that to knock down the price. Up to you whether you want to do the water pump at the same time, doesnt cost much more as the cambelt needs to come off for its replacement anyway. I paid £140 from an indy for a cambelt/pulley change.
Check for usual rust spots (arches, sills etc) Damp footwell as above, is a poorly fitted pollen filter seal. Very easy fix.
If its got the climate pack with front heated windscreen, test that as well.
Will you be able to test drive it?