shall be made by statutory instrument, and

shall lapse unless approved by resolution of each House of Parliament during the period of 28 days (ignoring periods of dissolution, prorogation or adjournment of either House for more than 4 days) beginning with the day on which the regulations are made.

does not invalidate anything done under or in reliance on the regulations before the lapse and at a time when neither House has declined to approve the regulations, and

does not prevent the making of new regulations (in new terms).