https://www.slab.org.uk/guidance/submission-of-account-of-expenses-when-must-your-final-account-be-submitted-by/
An online civil synopsis/case conclusion must be completed and requires approval before you can submit the associated account can be submitted. In the majority of cases the approval will be instantaneous.
To submit the synopsis follow our guidance
You must send us your account together no later than four months after the date of completion of the proceedings for which civil legal aid was granted. Completion of proceedings includes work in connection with obtaining an award of expenses, modification of expenses, settling with the witnesses, obtaining an extract of decree etc.
We may accept an account submitted later than four months if we consider there is a “special reason” for late submission.
Possible reasons include:
We would be unlikely to accept forgetfulness or understaffing as special reasons for late submission.