Question to the Home Office:

To ask the Secretary of State for the Home Department, what the guaranteed fulfilment period is for (a) issuing new and (b) renewing (i) children's and (ii) adult passports.

The gov.uk website sets out expected turnaround times for applications made in
the UK and, on a country-by-country basis, for applications made overseas. HM
Passport Office aims to deal with applications within published turnaround
times, but this is a guideline only as there are a number of factors that can
affect how long it takes to process an application.
The premium and fast track service provide a guaranteed turnaround period of
four hours and seven days respectively on payment of an additional fee,
provided the applicant has submitted all the relevant information and the
necessary security requirements are met.