Huh? They are.
Anyone who is reselling TTB is doing so over TTB Wholesale.
The discussion was around the differences between Talktalk, Talktalk Business (the ISP) and Talktalk Business the backhaul wholesaler.
A reseller simply resells another ISP's service.
Er no, TTB offers two products to Resellers, Managed and Wholesale.
Managed is TTB in all but name, using TTB IP Addresses etc.
Wholesale connects into the Reseller's own interconnect, using the Reseller's own ip addresses etc for their customers.
Two examples:
TTB Managed = Post Office or Shell
TTB Wholesale = Andrews & Arnold or Zen
Both backhaul over TTB at the local Telephone exchange, but are very different at the other end.
so to add to your list:
The discussion was around the differences between Talktalk, Talktalk Business (the ISP), TTB Reseller Managed Service and Talktalk Business the Wholesaler.
All backhaul over TTB