“(2) The Minister may at any time on his own motion and at his discretion revoke or suspend for such period as he shall think proper a merchandise licence—

(a) on the ground that, in his opinion, there has been a breach of or a failure to observe or comply with a condition attached to the licence,

(b) on the ground that the holder has been convicted of an offence (whether under this or any other Act) in relation to the business to which the licence relates or a vehicle used in such business,

(c) if the holder ceases to comply with any relevant requirement specified or referred to in regulations under the European Communities Act, 1972, or

(d) on the ground that, in his opinion, there has been a failure to comply with a relevant provision of this Act or of regulations made thereunder.”.