Welcome back to the Function Room, And this time, it’s about QUEUES. This has been a summer of queues. A flurry of covid tests and two vaccinations have meant a brush with Big Queue. Which got me thinking  - What makes a good queue or a bad one? And is there any maths behind it. There’s a hatch free so step forward, Professor Ken Duffy, director of the Hamilton Institute in Maynooth University to tell me about Queuing Theory.As usual on the Function room, the topic goes off in all sorts of directions. Along the way we find out about old telephone exchanges, how Victorian Britain’s worries about their Lordships going extinct led them to develop theory that was used a century later to look at viruses and what it takes to get your mathematics soldered onto a computer chip.