The Secretary of State may by regulations make provision for—
the combination of polls at ordinary general elections for membership of the Parliament with polls at parliamentary by-elections, and
the combination of polls at extraordinary general elections for membership of the Parliament, and by-elections for membership of the Parliament, with polls at parliamentary by-elections or parliamentary general elections.
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The Secretary of State may not make regulations under this section without the agreement of the Scottish Ministers.
Regulations under subsection (1) may—
apply, with or without modifications or exceptions, any provision made by or under the Representation of the People Acts ... or by any other enactment relating to parliamentary elections ... or local government elections, and
modify any form contained in, or in regulations or rules made under, the Representation of the People Acts so far as may be necessary to enable it to be used both for the original purpose and in relation to elections for membership of the Parliament.