Well, I ended up buying some Tuffy from Tuffnell Glass and it is indeed easy to use and easy to get out of the beads. The data sheet that comes with it actually gives the composition and percentages thereof, so I might have a go at making my own one day.
I say 'beads', although mine look like they've had a hard time and aren't anything I'd want to make jewellery out of! Lop-sided, sharp holes on one side, very dodgy 'flowers' and taking about half an hour each (still not sure the torch is set up optimally). I've made 6 so far and can't wait to get to the torch each day.
I will try twisties too. I've managed stripey green ones, although it seems that having two colours of glass makes the stringer-pulling revert to the original short and lumpy situation, for some reason.
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