That does seem a very good deal! Depending on spec, colours etc.
However.... Go in with eyes open and I'd advise getting a ppi done on it, as there's a few things that could need doing that could makes it seem not quite so cheap.
When you say sport MC, do you mean Mc-shift? Or MC auto?
If its the MC-shift (my preferred option, but each to their own ) then 31k miles is getting into new clutch territory, (£2.5-3k) so I'd want a clutch reading done minimum.
Also, if it were to need tyres, and brakes as well, then the price starts looking closer to market anyway. Still might be worth having though.
Good luck. I hope its a good one and you get a cracking car for not much money!