Location work for this two part story was completed in Malta.
The helicopter seen (F-BOSD) is a SUD Aviation SA3180 Alouette II c/n 1966. This model is differentiated from the Alouette III by its open frame tail boom.
As with The Fiction Makers, this is normally broadcast as a full length feature film (for instance by TPTV) and therefore omitted from ITV4's permanent rerun.