For what it's worth, my exchange had TalkTalk (CPW) on its exchange for a while, but not in my part of the exchange. However, it did make my exchange qualify for Market 2, and when the Mkt 2 re-classification by Plusnet to Mkt 3 prices occurred, it meant I got Mkt 3 pricing, although I could only get broadband via BTw.
Since the classification is merely an administrative issue, one wonders if Plusnet can ask BTw to get Ofcom to re-classify the exchange. IMHO they should be reclassified as the parameters are met.
/stirs the argument a little.