My favourite paints and a popular choice amongst artists are Golden Paints. They're expensive but quite unrivalled in there pigmentation and texture. I use their heavy body and fluid ranges. The neon's are so intense and bold and I love the phthalo blue and green fluid paints. I also really recommend Derivan Matisse paints, I particularly like the colour Midnight Blue (available at Jacksons.co.uk). Its an Australian brand and quite hard to get hold of but the colours are dreamy. For a more budget friendly products I like, Vallejo Fluid paints and Jacksons own brand paints which are really good and smell amazing too! Another go to is System3 by Daler Rowney - you can't go wrong with their paint but I particularly like the heavy body acrylic - its probably the thickest creamiest paint I've come across and its texture is gorgeous. All of these are available at Jacksons.
POSCA - I first discovered these paint pens when I was creating my handmade jewellery and although I don't use them so much the thin white pen is still very much a staple in my work. The opacity of the colour is fantastic!
Brush and Squeegee - As I keep unscaling my work the tools keep getting bigger. I love this massive brush and this squeegee (as it reminds me of my textile print days) but I also love using window cleaning squeegees and DIY brushes and trowels. A favourite go to brush through is a Daler and Rowney System 3 Flat wash - they come in sizes from 25mm to 75mm and are smooth and lovely to use.
Varnish - I've tried Matt, satin and gloss varnish previously but at the moment by favourite is satin. Windsor and Newton is my go to varnish. I buy cheap synthetic brushes just for varnishing - and try to keep them away from the paint pot.
GAC100 - Another artist favourite - this acrylic extender is a wonderful liquid that pushes what you can do with acrylic paint. I use this and other fluid mediums to give my work texture and help with glazes.
Baby wipes - I try not to use too many of these as a resuse damp cloth is better for the enviroment but the wipes do still have their place. Great for wiping on glazes and great for taking off paint to reveal layers.