Sadly just because it was lost doesn't guarantee that it was among their best work. To be fair TV was probably changing quite rapidly as well in those days, its difficult to judge it by our standards. The appearance by Dick Emery may have been a watercooler moment.I saw that Morecombe and Wise lost tape thing. It has not aged well.
As an aside I had never heard of Los Zafiros, I had assumed the were Spanish and were a product of package holidays. Wiki tells me they were Cuban.