11. Any order made, licence granted or other thing done under the Licensing Act 1964 by the licensing justices for an existing licensing district, being an order or licence in force or other thing having effect immediately before 1st April 1974 shall continue to have like effect on and after that date as if the Local Government Act 1972 had not been passed but shall be treated as if it had been made, granted or done by the licensing justices for the new petty sessions area in which the premises concerned are situated.