> Fact is in a busy station on a morning even if you knew someone was a terrorist and could see him you couldn't actually shoot him without gunning down about 30 civilians between you and the bad guy.

The Met use the MP5SF (Single-fire) variant (routinely anyway - I'd imagine they have access to other weapons for specific situations), so it isn't necessarily accurate to refer to it as an SMG. It'd take serious misuse of such a weapon to end up gunning down 30 civilians.

https://www.theguardian.com/uk/2009/oct/28/met-armed-police-...