https://www.slab.org.uk/faqs/2-encourage-solicitors-and-counsel-to-familiarise-themselves-with-and-make-full-use-of-existing-interim-fee-and-reimbursement-of-outlays-schemes-including-for-solemn-criminal-legal-aid/
Please see our guidance on existing interim fee and reimbursement of outlays schemes, available here.