'Mixology' - I searched around for advice & tips and then thought that the best thing to do was to try other peoples recipies. There are thousands on ELR - most are rubbish ( Capella Custard V2 version 6 - why bother posting it?). The other thing that confused me was the abbreviations used - FA, TPA - beware of anything that says 'Apprentice'. It means that they don't really know what they are doing. Stick to flavours from from the 'masters'.
Some advice that you can safely ignore is the ' try a drop of the concentrate in a teaspoon of water'. I tried it yesterday with Flavour Wests Butterscotch, Brandy ans their Rice Krispies. All foul tasting - ruined my taste buds for about six hours.
I've got to the point where I have a couple of 'custard bases' that are OK. Trouble is they are 'bases' - I'm trying to find the flavours to add to them.
Anyway good luck with your search Simon - I'm not sure that this DIY thing is worth it - is it fun or just a waste of money and time? My problem is that I have to wait weeks between batches - the curse of custards ....