18. A certificate issued by—

(a) BGÉ or Gaslink, with the concurrence of the network company, or

(b) the network company with the concurrence of BGÉ or Gaslink,

stating that—

(i) any asset specified in the certificate, or any interest in, or right over, any such asset, or

(ii) any right or liability so specified,

is vested in the issuer of the certificate by virtue of this Act shall be proof of that fact in the absence of evidence to the contrary.