I was assigned the Hemel Hempstead Passport Office for my passport application.
Application created on the 27th December.
Old passport posted by Signed For 1st Class on the 28th December.
Royal Mail delivered the passport to the Passport Office on the 6th Jan.
New passport delivered to me on the 12th Jan.
Stages of my passport application from gov.uk:
Passport printed 10 January 2023
Application approved 10 January 2023
Documents received 10 January 2023
Application received 27 December 2022
Application submitted 27 December 2022