This is what I need, people with some technical knowledge - it's all double dutch to me.
I've always relied on my dad, but he's very poorly these days, currently in hospital, and the only metalwork on his mind is the stuff holding his disintegrating bones together 
Anyway, I've been looking at \link{http://www.maplin.co.uk/Module.aspx?ModuleNo=4069&criteria=N29AR&doy=17m4\this soldering iron}. Do you think that looks suitable?
My mum gave me some solder today from dad's workshop. But it's really thick - about 8mm or so. I also suspect most of it will probably not be lead-free. In E'burgh the boys used solder wire - about 1 mm thick, which was dead easy to handle. Then my dad asked me about flux?! What's that? I'm confused!
I am thinking \link{http://www.maplin.co.uk/Module.aspx?ModuleNo=2819&criteria=N29AR&doy=17m4\this is the kind of stuff we need} Yes?
My parents also reminded me that my uncle owns a very successful electronics company - I'd forgotten
So if the boys get really into it, and want to design their own stuff, then we can probably catch him in a good mood and get a big pack of "useful bits" from him. But that's a long way down the road.
I understand the very basics of circuits - battery, switch, bulb ... that sort of thing. But I really need a beginner's tutorial. I have no idea what resistors are or capacitors or transistors. And when I look at the basic circuit diagram of something like \link{http://www.madlab.org/kits/lights.html\this simple circuit} I cannot understand the diagram, I don't know where the electricity is flowing and I cannot begin to follow the explanation!
And I HATE not understanding things 
Especially if I suspect the boys are beginning to understand more than me!