I've not read the whole 2 year thread, but thought I'd add my current experience to help/commiserate with others.
My DHs renewal application is currently at Durham. We sent it via PO Check and Send on 13th May, and they acknowledge it being 'received' on 17th May with them. As advised, they will not even consider discussing it until they have it for 3 weeks which takes us to Fri 5th June. We fly to France on Tues 10th June.
We phoned the 0300 number who were pretty useless. So today DH called the 0845 number. They said they will escalate to the upgrade team, but it will not be Friday until it is even looked at for consideration, and if it does, it will go to the back of the queue behind urgent applications for upgrade based on compassionate reasons (illness, funerals, etc). They will phone us on Friday to let us know what the situation is. So the earliest we might be able to get it is Sat or Monday....and that is by courier or if we collect in person. We're in Edinburgh so Durham not a million miles away, it's doable.
Guy at Durham was nice, although I think they are a bit cheesed off at folks using the 0845 number! He did say there was a big backlog at Durham. Essentially DHs renewal hasn't even been looked at, so the 3 weeks standard trunaround is nowhere achievable at the moment.
Its not the end of the world, worse case scenario is that I fly out with kids on Tues and DH joins us later that week. It will cost us extra though, extra for the upgrade, extra for the flights etc etc, but not a lot of choice.
This is completely our error. We should have checked the passports before, and I'm kicking myself for not doing it earlier. One thing I have sworn is that I will always ensure we all have passports that are valid, regardless if we never use them. It just removes all this flapping and panicking. The ironic thing is, we thought that we would be ok using check and send and get a renewal back in 3 or so weeks. We actually would have been quicker and calmer (although pricier) to try and get an appt at Glasgow Passport Office and get a premium service, same day passport.