From 1 October 2019, all first-time certificates/licences for the UK and Ireland will be issued valid to 31 December 2020 rather than 31 December 2019. 

ACCA audit firms - Ireland audit client info
ACCA audit firms - UK audit client info
Application to register as an ATOL Reporting Accountant Firm
Application to register as an ATOL Reporting Accountant
Application to register as an ATOL Reporting Accountant from an individual who is not a member of ACCA
Application for a practising certificate
Registration form for register of practitioners (non designated territories only)
Application for exempt regulated activities (UK)
Application form for a firm's auditing certificate (Ireland)
Application form for a firm's auditing certificate (UK)
Audit register info (Ireland)
Audit register info (UK)
Audit qualification - additional info (electronic)
Continuity of practice opt-in
Incorporation notification form
Notification of a new firm form
PIB form (UK)
Practice change of details notification
Application to register as an authorised legal activities individual
Application to register as an authorised legal activities individual from an individual who is not a member of ACCA
Application for a firm's legal activities certificate

You can notify ACCA of any changes to your firm's details by downloading the 'Practice change of details notification' form.  Alternatively, you can notify ACCA of any changes at authorisation@accaglobal.com