“(a) the return or, as the case may be, the VAT shown on the return was dispatched at such a time and in such a manner that it was reasonable to expect that it would be 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 dispatched, he shall not be liable to the surcharge…… he shall be treated as not having been in default in respect of the prescribed accounting period in question ( and, accordingly, any surcharge liability notice the service of which depended upon that default shall be deemed not to have been served)…..”
“ ….. (b) 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 reasonable excuse……..”