Well here's a set to identify- I won't spoil the end of the clip! It certainly seems to take the audience by surprise
This is a sketch brings tgoether two hugely popular Thames series of the time, namely Callan.... and Father Dear Father! It's from The Edward Woodward Hour, made in 1971, so that would make the tv pretty much new.
https://www.youtube.com/watch?v=5NkU...1hOg&index=341
Steve