The Hidden Truth: 1.2 The Shape (23rd July 1964). Written by Roger East; dir. Stuart Burge. Featuring regulars Alexander Knox, James Maxwell, Zia Mohyeddin, Elizabeth Weaver & George Moon; guest starring Glyn Houston & Dudley Foster.
A charred body is found in the remains of a burnt-out warehouse, and Lazard and his team are given the macabre task of proving whether the man [was] murdered or simply the victim of unfortunate circumstance. [IMDb]
In looking into this unusual case, Dr da Silva (Zia Mohyeddin) uses a new scientific method and gets an unexpected result. And the vital clue to the mystery lies in the shape of a boiler-suit.
Glyn Houston guested as Harry Kingsley, Paula Byrne as Jane Kingsley, Dudley Foster as Ernest Malet, & Pauline Stroud as Liz Mason.
[For some reason IMDb lists this as “The Boiler Suite Shape” [sic] but all the newspaper schedules refer to it as “The Shape.” ]
Written by Roger East (aka Roger Burford), who had recently adapted a dozen Maigret stories for the BBC series (1960-63) (hi @mariocki old telly really always is incestuous, isn’t it?), he had been screen-writing since the 1920s and his credits include the scenario for the Carol Reed film Bank Holiday that brought Margaret Lockwood to national attention (just in case I wanted things to get any more incestuous, hi, me)
This was the first episode to feature Zia Mohyeddin’s character, Dr Hamavid da Silva, said to be “a post graduate from Ceylon [Sri Lanka]”.