I think you & me can understand why the UK airlines would like to keep *potential competitors* out.
Politics is still a game where he who can pull the most strings (BA & UK Gov't), gets what he wants.
The fact is though, until LHR expands, there is not much point in scrapping or amending Bermuda II, because LHR will not be able to handle any more new slots (at least the number DL and others would like).
Secondly, I beleive the *official* line (and I stand to be corrected), is that the UK Govt's impasse on Bermuda II with the US, is as a result of the US not permitting British carriers cabotage rights within the US.
(Apparently BA and others would like to exploit the juicy US Domestic market). Now, if the US Gov't says "no", I smell a whiff of protectionism on your side of the "pond" too! Tit-for-tat.