I was Vaxxed with AZ in March (cohort 6)
I had a terrible reaction and felt ill for weeks.
Triggered my asthma and affected my autoimmune condition.
I decided against a second dose of AZ and tried my upmost to get Pfizer / Moderna as a second dose.
I wrote to the CCG and even contacted our local counsellor for support.
I was still refused and am now only single vaccinated. 
I was speaking to a friend a few days ago who is social care staff, she told me that her trust have been informed about boosters and that she will likely get Pfizer following being double vaxxed with AZ in Jan & April.
So MRNA boosters will be given regardless of your first vaccine?
I still cannot get MRNA as my second shot.
I don’t even know where I stand with boosters…