https://www.slab.org.uk/guidance/bar-on-mixing-fixed-payments-and-detailed-fees/
Where you provide criminal legal assistance, whether summary criminal legal aid or ABWOR, where a fixed payment has been prescribed, you are not entitled to any other payment out of the Fund in respect of your fees and outlays included in the fixed payment (listed at regulation 4(2) of the regulations), except in the following circumstances, all in circumstances where excluded proceedings take place beyond the summary court proceedings, and are chargeable in addition
In practice, only proceedings under section 174 are likely to arise in the course of a case.
You are entitled to reimbursement of any other outlays properly incurred.