From 1991: Anyone remember CHIMERA, the Anglia TV drama/ horror based on the Stephen Gallagher novel? The TV tie-in edition of the original 1981 novel is pictured here.
The four-parter was - apparently - a last-minute commission when a drama gap suddenly opened up in ITV's summer schedules... and Anglia (one of the mid-level companies in the system) were able to step in at short notice.
The first episode is a Hitchcock style bluff that sets things up for the meat of the three parts that follow. Anglia also produced a shorter done-in-one TV Movie version (which gives you a hint at the amount of padding in the full-length version) which was subsequently 'repeated' on ITV and released on VHS. It was probably also offered to overseas buyers as an alternative to the full multi-parter. The edited version sometmes goes under the how-many-meetings-did-it-take title MONKEY BOY. The original version has been released on DVD and is worth picking up for some undemanding chills... albeit with some dodgy performances and bad dubbing.