National Security Bill

The Minister has given us an explanation and I accept that the reference to a constable is to a United Kingdom constable, but Clause 6 gives the constable the power to clear people out of prohibited places. Why is it necessary for United Kingdom law to apply? Why is it not enough that this power should exist under the Order in Council applicable to the SBA? Since only the United Kingdom constable is covered in Clause 6, how can it possibly be necessary to define “prohibited place” for the purposes of Clause 6 as including places outside the United Kingdom? I just do not understand it.