Hi, Go to www.simplypainting.com
by world famous artist, Frank Clarke. you can get free lessons, which are limited, and if you join up, there are lots of extra lessons you can access. About £40 for the year, but as far as I know you get a starter kit as well for that price, ( anyway I did, but I'm not sure if that's still on, I've been a member for a good while now).
Doesn't offer any qualifications though, but is very useful, for Watercolour & Acrylic painters. hope this helps
Cheers, and good luck.