Yup, his were some of the first apple videos I watched. I'm still working on tracking down some of the varieties he grows.
Edit (a mostly complete rundown of my experience with the apples I learned about from Stephen):
I finally found Suntan wood this year and grafted May Queen last spring. I'm still looking for Blue Tit (euro plum).
Egremont Russet is a very good high sugar apple, but has too many problems for me (especially rots) and I've been grafting over it.
I like Kidds Orange Red a lot (big, crunchy, flavorful), but over-cropped my tree too badly- broken branches and it eventually declined, part of which I think is due to the interstem rootstock. I've grafted it onto other stocks.
Ashmead's Kernel is a high sugar, high flavor apple that I really like. A negative is that it gets some bitter pit.
If all goes well, I should be getting a better sampling of Adam's Pearmain, Pitmaston Pineapple, Court Pendu Plat, and Winston. I had one very promising St. Edmunds Pippin and hope for more.
I have a Orleans Reinette tree which runted out. That reminds me that I should look for a bit of wood on it, to put on something more vigorous. I actually found it once in a grocery store and it was excellent.
Maybe in the future, I'll graft Baker's Dozen or Devenshire Quarenden. For now, I should probably focus on getting my current trees productive.