I've read many people here who purchased Priority Service after the fact, but I cannot find any official process for this posted on the gov.uk website or elsewhere.
As I understand it I can pay the fee online, then email my receipt into Sheffield with my application number and tracking number.
Can I just follow the process and be assured of acceptance? Or is there any special prior approval needed? My application was just received in Sheffield, but I want to be assured of a decision before December.
Thanks very much for your help.