https://www.slab.org.uk/faqs/voluntary-attendance-at-police-station-by-client/
However, if the client is not interviewed, and not detained at all in the police station but is charged and released, then no claim can be submittedf under the A&A regulations introduced for the Criminal Justice (Scotland) Act 2016. Where no interview takes place, and the client is not detained, then you can still grant standard advice and assistance in the normal way.
Any time necessarily engaged with the client in the office would not be covered under the CJA advice and assistance. A separate grant of standard advice and assistance (with standard eligibility criteria and a contribution, if any) should be made available to the client if they are eligible, to cover any work actually, necessarily and reasonably done prior to the voluntary attendance. The standard accounts procedure also applies.