Important thread. Conclusion basically being "the UK government is running a real-time experiment on its population, let's hope it works".
As posted further up, in the Pfizer trials 80% were given vaccine upto 10 weeks after the first with the other 20% presumably even later.
So although it wasn’t given official approval for the 2nd dose to be up to 12 weeks after it clearly still works in providing immunity upto that timeframe.
Let’s not forget it’s the MHRA who approved this policy who are or should be completely independent. Van Tam was speaking about it yesterday too.