Final update from me as I now have passport in hand! This forum has been very helpful!
Worth noting that I never received anything from TNT with regards to tracking and was just checking the site myself with the PEX code.
Passport Received in hand – 3pm Monday 28th March 2022
Passport Tracking on TNT – Thursday 24th March 2022
Passport printed 4:52am on 22 March 2022
Application approved 1:14pm on 17 March 2022
Documents received 6:29am on 15 March 2022
Documents signed for (Royal Mail) 2nd March 2022
Application received 4:23pm on 28 February 2022
Identity details received 4:23pm on 28 February 2022
Email sent to person confirming your identity 9:18am on 23 February 2022
Ask someone to confirm your identity 8:57am on 23 February 2022
Application submitted 8:57am on 23 February 2022