At the urging of @BeebsyMcA I'm now interrupting my tangent about inadvertently disturbing UK ad spots with one where the intention was to disturb. So, CW for guns and violence.
This was an ad-spot broadcast on Northern Irish TV in the late 80s - promoting an anonymous anti-terrorism tip-line.
It's a really effective spot, notably for a pre-Tarantino juxtaposition of a Golden Oldie with distressing violence.