4. Except where the public body’s plans certificate is combined with a public body’s notice, no public body’s notice was in force in respect of work described in the certificate at the time the certificate was given.
5. A public body’s notice was in force with respect to the work described in the certificate at the time the certificate was given, but—
(a)the certificate is not signed by or on behalf of the public body which gave that notice; or
(b)that body has ceased to be a public body within the meaning of section 54 of the Act.