A surprise discovery on a day trip to Horsham!
Town & Country Weigh is at 7 East Street, Horsham, West Sussex, RH12 1HH.
It has bulk food bins for rice (long grain, short grain, arborio, basmati), dried pulses (e.g. black eyed beans, chickpeas, butter beans, red lentils), flours (including rye flour and potato flour), milk powder, and a wide variety of muesli ingredients.
Thanks to Kake for the above write up. Please, if anyone knows of any more, do add them to the list!
Loose Food Fill lists all the shops that sell loose, food of the kind that normally comes plastic packaged ie rice, pasta and salt.
Take your own plastic free bags and refillable pots.