Excellent suggestions, thanks so much.
I think perhaps the ideal resource is hiding somewhere under crosh's beer supply.
I started out many years ago with crystal short wave radio but got diverted into philosophy and languages, you know how it goes. At that time we were just transitioning from valves (vacuum tubes) to transistors, and yes I know what a grid is in a tube context, but it's the modern bits that flummox me. A new challenge...
Good suggestion cowjam, sometimes a person just need a nudge in the right direction.
Crossroads, all good ideas, but a bit beyond my imagination just yet. I'm still at the stage where I manage to have my UNO transmitting so fast on the serial port that I have a hard time getting my revised programme uploaded! That one won't happen again.
By chance I note that the servo that came with my kit (Hextronik 9GR) has just the kind of connector I am looking for. It's a three pin female spring clip type connector. I can probably get them by the thousand somewhere.