Final timeline below
Application submitted 28 May 2020
Application received 28 May 2020
Documents received 11 June 2020 (posted from Portugal and took 13 days to be delivered, Royal mail delivered to passport office on 10th June)
Application being processed 12 June 2020
Application approved 25 June 2020
Application printed/posted 26 June 2020
Passport delivered to me in Portugal 2 July 2020