https://www.slab.org.uk/guidance/submission-of-aa-accounts-including-diagnostics-date-by-which-we-must-receive-your-account/
You must send us an advice and assistance account within one year of the last entry which can properly be construed as being advice and assistance (oral or written advice on the application of Scots law to any particular circumstances which have arisen in relation to the person seeking the advice).
For diagnostic accounts the time limit is three months from the last advice given.
The last entry does not include:
We may give discretion if we consider there is a special reason for the account being submitted out of time.
Examples of a possible special reason are:
We are unlikely to accept forgetfulness, ignorance of the regulations, lack of staff or a law accountant’s delay as being a special reason.
There is no discretion for late submission available within the regulations for diagnostic accounts.