“If a person who, apart from this subsection, would be liable to a surcharge under [s 59(4)] satisfies the Commissioners or, on appeal, a tribunal that, in the case of a default which is material to the surcharge- (a) the return or, as the case may be, the VAT shown on the return was despatched at such a time and in such a manner that it was reasonable to expect that it would be so received by the Commissioners within the appropriate time limit; or (b) there is a reasonable excuse for the return or VAT not having been so despatched.”
“where reliance is placed on any other person to perform any task, neither the fact of that reliance nor any dilatoriness or inaccuracy on the part of the person relied upon is a reasonable excuse.”