(1) The regulator may, by notice (a "notice to withhold") to the registry administrator, require the registry administrator to withhold allowances that would otherwise have been allocated in respect of an installation under article 34E or to a person with an entry in the aviation allocation table under article 34O in any of the following circumstances -

(a) if the regulator is investigating whether the installation has ceased operation;

(b) if the operator of the installation has applied to surrender the installation's permit under paragraph 11 of Schedule 6 but the application has not yet been determined;

(c) if a surrender notice under that paragraph or a revocation notice under paragraph 12 of that Schedule has been given to the operator of the installation but the surrender or revocation of the permit has not yet taken effect;