The number of persons in a reserve force who are liable to be called out under this Part shall not exceed the number for that force for the time being authorised by Parliament.

Any persons who are in service under this Part shall not be reckoned in any numbers for the time being authorised by Parliament for any of the regular services.

The Secretary of State shall from time to time lay before each House of Parliament a report with respect to the exercise of his powers to call out persons under this Part.

Any such report may be made either with respect to any use made, or with respect to any use proposed to be made, of those powers.