This may be of help if anyone is still looking for brushes
I have been using some Rosemary & Co kolinsky sable brushes as a result of reading this thread for a couple of months now. Sizes 3, 1 2/0 & 10/0
Good for acrylics and OK for thin enamel, they hold paint well and have kept the points so far, though don’t have a lot of spring but you can control them well.
Don’t use them for dry brushing or anywhere you may be working paint into tiny places etc, you will probably ruin them.
I also use W&N one stroke flats, OK for me.
Also used a Humbrol green handle flat that is OK.
W&N Sceptre golds are also worth a try, sable/synthetic hairs
I’m still to settle on my ideal enamel brushes, I have used Pro Art prolene synthetics in larger sizes so may try these. Synthetics seem to have stiffer bristles.
Ken Bromley was mentioned as a supplier, I have used them for watercolour painting supplies, plenty of choice and good service.