Opening fight by lake with Templar escaping in his Volvo across a bridge filmed at Tyke's Water, near Elstree. Used in numerous films and TV especially Hammer 1960s.
The opening scene where Simon is fishing is supposed to be Ireland but it is actually Elstree UK. In fact, the bridge that Simon and Mildred drive over to escape is the same bridge that Tara King runs across in the title sequence of season 7 of The Avengers (Tykes Water Bridge, Aldenham Park, Elstree).
A unique opening; whereas most episodes begin with someone saying something like , 'that's the famous Simon Templar' (along with the requisite halo and theme music), this episode begins when Templar says, 'it's no secret about my name; it's Simon Templar' - followed by a dramatic pause with Templar looking up (whilst driving!) for his momentarily delayed 'halo' appearing.