Terrified by Mr Tapp the undertaker

What is the most frightening television programme you have ever seen?

Back in 2007 I answered that question like this:

For me it is probably the episode of Sexton Blake in which the hypodermic-wielding villain measured Tinker for his coffin while he was still alive. Mind you, I may have been as young as seven when I saw it.

After that, as I went on to say in that post, it was Don Taylor's television play The Exorcism, which I saw when I was 12.

According to an upload on YouTube only one episode of ITV's Sexton Blake series of the 1960s survives - you can see it above. Sadly, it contains no sinister undertakers.

What interested me most was one of the comments below the upload:

Many thanks for the upload. I can remember watching this series as a youngster, and being terrified by one of the villains, a sinister undertaker by the name of, if memory serves, Mr Tapp. Such a pity no more episodes remain.

Mr Tapp must surely be the undertaker who scared me too. 

A little research shows he appeared in a just one two-part Sexton Blake story and that those parts were screened in January and February 1968. So I was indeed just seven when I watched them.