Hi, I’m on similar timeline. Submitted application 29th. Everything received by Passport Office 30th June(confirmed by Royal Mail), but only got confirmation from Passport office that documents were received on Friday (10th July). No one can give an explanation on the delay when some cases have been sent, processed and received in the same time.
Calling like crazy today to try and get some form of escalation and eventually got somewhere, waiting to see if it moves things along. Seems to be pot luck based on whether the operator feels like helping or not. My advice is get calling as soon as you receive confirmation that your docs have been received.