QUOTE(fsharpminor @ Nov 2 2009, 12:44 AM)

This is not a difficult piece and certainly not higher than Grade 7.
I guess that depends on what standard of performance you'd be satisfied with. After all it is not really the PIECE that is grade 6, grade 7, or whatever, it is the pianist.
You can (and probably should - they are marvellous music) make a decent stab at most of Mozart's piano compositions at Grade 5 or Grade 6, but to perform them with credit is a different matter. Lots of them are mostly straightforward, but unfortunately (so far as performing them goes)with just a handful of tricky bars that demand much higher levels of dexterity.