After section 1 of the European Union (Withdrawal) Act 2018 (repeal of the European Communities Act 1972) insert -

"Savings for implementation period

1A Saving for ECA for implementation period

(1) Subsections (2) to (4) have effect despite the repeal of the European Communities Act 1972 on exit day by section 1.

(2) The European Communities Act 1972, as it has effect in domestic law or the law of a relevant territory immediately before exit day, continues to have effect in domestic law or the law of the relevant territory on and after exit day so far as provided by subsections (3) to (5).

(3) The Act of 1972 has effect on and after exit day as if -

(a) the definitions of "the Treaties" and "the EU Treaties" given by section 1(2) to (4) (interpretation) -

(i) included Part 4 of the withdrawal agreement (implementation period), other than that Part so far as it relates to, or could be applied in relation to, the Common Foreign and Security Policy, but

(ii) were otherwise limited to anything which falls within those definitions as at immediately before exit day so far as it is not excluded by regulations made on or after exit day by a Minister of the Crown under this sub-paragraph,