Crewe, if you can send some-one round, i cant phone them, i dont know what to say!
Call TRANSCO 0800 111999 and tell them your co alarm has activated. They will send an engineer within 1 - 2hrs to check your appliances. They will not be able to fix any problems but they will make them safe for you. Its free for this call and for the engineer to visit so it wont cost you a thing.