I don't use dropper bottles - I have screw-top jars for my Tamiya paints, and if I'm brush-painting I use a palette with a small amount of paint, and do the jar up in-between uses.
If I'm using GW paints (I use their metallics on occasion, and I'm using up the last of their other paints I have left over from my wargaming days), then I do the same: use a palette with a small amount, and close the jar between uses.
I bought the palette from a cheap budget shop that had some art supplies. You can use old tiles, an old plate, or anything else similar. Even an old plastic lid from a tub works.
When it comes to modelling tips, btw, for wargaming or otherwise, Google is your friend. I've picked up loads and loads of useful tips on using household items for modelling that avoids spending hundreds (if not more) of pounds on overly expensive specific kit.
I actually prefer dropper bottles as many a time I've clogged up detail because I have a 2:1 mixture of paint-to-water. I really suck at measuring the amount I get from my brush. now if Vallejo had a counterpart for Calgar Blue, then I'd be really happy. sadly the don't so I'm just going to go with Scorpy green.
And I think I won't go with Minitaire anyways. my friends say that they're a bit glossy, which isn't what I want. and I do use a palette, I'm actually using a piece of plastic that was once a mixed nuts container top.
essentially, I do know a lot of what you recommend. I have used google before but really haven't gotten any real luck on the things I research.
on another note,I am jealous of you. you live in the UK.
you don't have to pay 12% on shipping :l