Oh yes, that was me:
Welcome to Cheviot Trees (cheviot-trees.co.uk)I just had a quick peek at the website and I can't immediately see larger trees than cell grown ones, however, I know they do them as I bought 2 six foot trees, a beech and a red oak (around £30 ish) for specimen planting.
In spite of the awful drought we've had this summer all the trees except a couple of hollies have come through - other than the 2 mentioned above, all were cell grown.
Have a look at their website then give them a ring which is probably what I did and they can tell you which bigger trees they have and make a recommendation of the best size for your needs. They really are helpful.
In fact, bareroot trees do better than cell grown ones but the only ones I have previously bought are from companies I will not go to again.
Cheviot trees are a genuine and friendly company, doing their best for their customers.
MTS: A little niggly something is telling me there's another part to their website which is relevant, but I couldn't see it immediately