I am in the process of working on a project for a historical orchard. They have these varieties listed and while I can find reference to them I am having a hard time finding a scion source for them. I am hoping that these varieties may also be known by other names. Any help would be appreciated!
Months after the fact, I hope you know by now all three of these apples you listed are known (to the best of my knowledge) only by those names.
Lamb Abbey Pearmain is heavily documented in the UK, having been a seedling planted in Kent, 1804 by a Mary _____. She used seed from Newtown Pippin, an apple arising in Long Island 1750 and an American cash crop to the UK. It was such a hit, in later years Queen Victoria had import taxes lifted on imports of Newtown Pippin. Royal favor has secured its identity.
Although most people refer to it as an English apple, I think one could make a case for it being a Yankee fruit, since the fruit and seed came from the States. (No clue beyond that for pollen parent.) I consider LAP American, just tested in Britain. I hope to graft it for my own yard in the next few weeks (just looked at the trees out back and find most are breaking bud.)
I am unaware of altenate names for either Keswick Codlin or Scarlet Surprise. Isn’t the latter quite recent?
BTW, I’ve done business with both Derek Mills and (Tony?) at Maple Valley Orchards in Wisconsin. Both have done well for me. As a back up, you might look into Temperate Orchard Conservancy next winter, if you still seek these, as they are replicating Nick Botner’s list and might have scions ready of all three.