No. 10 has rejected the Independent's report on Blair being rebuffed (and in fairness to No.10, the Independent derives considerable glee from suggesting differences between the UK and US, and the "cracks" in the special relationship). Its report was little more than speculation.
The UK has already indicated that it is unlikely to veto the deal; interestingly though, the Italians have suggested that they have not yet decided, although I can't see any good reason for them to reject it. It's not as if AZ wants to buy into any US carriers.
If "Good news" in a BA context means the use of the veto, that now looks unlikely. The good news probably means a six month delay in LHR coming into the O/S regime, i.e. until the opening of T5.