Versions of (b)

if an authorization granted by the Minister to use the certificate is not, in fact, in effect at the time the supply is made or the recipient does not export the property in the circumstances described in paragraphs 1(b) to (d), it is the case that the supplier did not know and could not reasonably be expected to have known, at or before the latest time at which tax in respect of the supply would have become payable if the supply were not a zero-rated supply, that the authorization was not in effect at the time the supply was made or that the recipient would not so export the property.