Flipper, do you think BP really cares much about the UK market?
Of the developed nations, they will negotiate the lowest price. The margin for BP will be, well, marginal.
I would think they make more (profits) in 1 year of product sales in the US than in lifetime product sales in the UK. That is one reason why most expensive drugs are first on market in the US. So yes, get it on the market on the US first.
Intentionally delaying the US and EU approvals by years to insure they have sufficient data for NICE is something BP would never do. Because they want to actually make money.
Besides which. Long term OS data does not require some magic time since last patient enrolled. It requires a sufficient mass of long term data.
IMO that data has existed for over a year. For better or worse.