Thanks for that, Grant. I was unaware of exactly how it worked.
Unfortunately, when I connected it all up, the led flashed repeatedly for a few seconds when I reset the potentiometer and then went out... sounds terminal and it doesn't work... where did I go wrong? I discount soldering errors as my hobby is Amateur Radio and I've been wielding an iron for 50 years or more.
What I did do was to turn the potentiometer with a small electrical screwdriver, as I don't have room for the plastic control. Might I have shorted something? Any suggestions welcome, preferably not rude, before I get another kit...