If I were you, I’d probably fast-track for peace of mind.
If you are going ahead with a standard application, make sure there are no issues with the photo.
I applied online 3 weeks ago, for renewals for myself and two young kids.
All photos taken at local Max Spielmann photo lab in Tesco.
When applying online, the system will automatically detect any potential issues with photos.
My photo had no issues. Both my kids had issues detected automatically with their photos (one not looking straight (very very slight angle), and the other too bright). I went ahead and submitted all applications anyway, having read that the online system can sometimes be a bit fussy and the photos usually end up being accepted anyway.
My passport arrived at the weekend, after just 18 days in total.
Meanwhile there has been no movement on the kids applications.
I think if there are no issues with the photos, things are generally quick and automatic.
If there are any issues with the photos, then it will go in a manual queue, where it needs checked by an examiner, and its a different story. Even if they are accepted, it’ll be after a potentially lengthy delay.