Mine was delivered today and here’s the history in case it helps anyone else
Passport delivered 23 March 2022 (TNT tracking visible 22 March 2022)
Passport printed 5:55pm on 16 March 2022
Application approved 1:11am on 15 March 2022
Documents received 8:26am on 11 March 2022
Documents signed for at Durham 01 March 2022 (Royal Mail)
Application received 10:40am on 26 February 2022
Application submitted 10:39am on 26 February 2022
Good luck and happy travels!