https://www.slab.org.uk/guidance/change-of-solicitor-under-summary-criminal-abwor/
Advice and assistance (including ABWOR) cannot generally be transferred but the regulations provide an exception in connection with summary criminal ABWOR [regulation 14A].
“14A.—(1) Where the solicitor who is providing assistance by way of representation in relation to a summary criminal matter has been required by the client to cease to act (other than where paragraph (2) below applies), the solicitor is to–
(a)notify the Board of that fact; and
(b)provide it with a statement of the circumstances so far as known to the solicitor.
(2) Where a client who is being provided assistance by way of representation in relation to a summary criminal matter wishes to have it provided by a different solicitor, the client is to–
(a) apply to the Board for authority to have that solicitor provide the assistance; and
(b) inform it of any reason for the application.
(3) The Board may grant an application under paragraph (2) above if it is satisfied that there is a good reason for the application.”
The same procedures apply to a transfer of ABWOR as for a transfer of summary criminal legal aid.
You should use Legal Aid Online.
Assistance by way of representation (ABWOR) in summary criminal proceedings
Learn about who is eligible for Criminal ABWOR and providing ABWOR, including initial limits, increases in authorised expenditure and withdrawal from acting.
Assistance by way of representation (ABWOR) in summary criminal proceedings
Find out about the availability of “Interests of Justice” ABWOR in a summary case where the accused client is cited to appear or appears on an undertaking.