https://www.slab.org.uk/guidance/specific-information-and-justification-required-for-our-assessment-of-fees-for-preparation-work/
We cannot properly consider claims for preparation where the narrative contains little or no information describing the nature of the work done. You should provide a detailed supporting narrative outlining:
It is not appropriate to claim a standard time charge for preparation.
You must give us enough information in every case to allow us to form an objective view as to whether:
Giving us this information also enables us to objectively identify inappropriate claims for preparation.
We would consider the following inappropriate:
You should be in a position to produce a detailed note or record that you have retained on file, summarising the nature of the work done and time spent during preparation.
You should retain and produce, if requested, any contemporaneous record or notes made during preparation