In some cases the effect of reserving a particular area was to leave a function in the hands of the Secretary of State for Scotland, which it was no longer appropriate for him to exercise. Such functions were transferred to other UK Ministers by means of Transfer of Functions Orders under the Ministers of the Crown Act 1975 (where the particular Secretary of State for Scotland was specified in the statute) or by means of a Prime Ministerial announcement (where the function was exercisable by the Secretary of State for Scotland as a matter of convention).  Entries under the heading “Residual Functions” note any relevant Transfer of Functions Orders, eg in relation to Medicines and Poisons (Section J4).
Residual Functions