I think you should call Leeds. Two years ago I was told by the English admissions tutor at a careers teachers' conference that they (Leeds) would bin any applications which didn't have the right predicted grades as a quick way of whittling down numbers. However, things which may have changed since then with the advent of the abolition of the ABB+ cap, so it may no longer be the hard and fast rule it was then. The other thing is that you are applying for a relatively less in-demand course, so they may be more flexible. Before wasting a slot on the form, call and get the current situation.