This video is about everything you need to get started for painting landscapes in watercolour. Useful too if you're already a painter trying to navigate your way through the labyrinth of manufacturers and products available on the market.

https://www.dalerrowney.com/discover...
http://www.stcuthbertsmill.com/

Useful online retailers (but if you can support your local retailers then please do so!):

www.jacksonsart.com
www.artsupplies.co.uk (Ken Bromley)