My favourite shops to buy online are:
Ther Art Shop Skipton great for paper and they do great deals and special offers worth signing up for
Jackson Art is my go to for beautiful brushes
Local Art shops:
Cass Art Art shop in Brighton
Seawhites of Brighton in Partridge Green has a great store
The Colour Pencils I did find on Amazon for the best price. They are normally about £14 but you can get here for just over £10
The Watercolour Pencils I also found cheapest at Amazon just over £10