I just boought an old Focus and the bite point on the clutch is very high. It doesn't seem to slip the clutch. Does this mean it's close to failing or does it just need adjusting?

It probably means the clutch is on it's way out, I'm afraid. There's no adjustment either provided or possible (it's a hydraulic clutch)

However, if the clutch isn't actually slipping then I wouldn't worry about it, unless you particularly want to have a new clutch fitted.