Not a lot to go wrong with the 1.8 tbh
Check for suspension knocks and creaks, try and make sure it has as few interior rattles as possible as they can be a nightmare to find and will drive you mad.
Check the roof at the seal for corrosion. Honda will usually repair under warranty ( mine is away now) but you're better off with one that's already sorted or at least agreement to sort in place.
Check the tape at the b pillars, water can get trapped and cause corrosion there too.
The 6th type R service is a £500 job, not sure if the 1.8 is the same but worth checking in and factoring in if its not been done yet.