At the end, Jacqui James, narrating, notes that Donald Bruce Mackay was forty four years old. Now he was born on Wednesday, the 13th of September, 1933, then disappeared on Friday the 15th of July, 1977, so, assuming he actually died at that exact time, he would not have turned forty four for another two months.
The fake British passport being used by Kiwi Terry (and those used by other drug couriers in later episodes) has a burgundy colored cover whilst in reality British passport covers remained navy blue in color until 1988.