In response to my post about the London Cheese Shop (no, not the Monty Python Cheese Shop, they actually have cheese, including Cheddar, and they weren't playing a bloody bazouki), my sister posted info on the name of the shop and their web link, and my Pa then found a US purveyor.
The shop is Neal's Yard Dairy - the cheeses are locally produced English ones with the names of the farmers on them! Here's the website:
David tried the Montgomery Cheddar, if you click the link you can see more pictures.
Me dear ol' Pa:
Not only that -- I went to the website and found that they retail in the USA via select fromageries. Voila! Montgomery cheddar!