I was able to buy bread flour and dried yeast yesterday from the small but perfectly formed health food shop, Down to Earth on Trinity Street. They have a great range of items in stock, including: fresh fruit and veg from Riverford; flours and yeast; pulses; grains; and refills of Ecover and Faith in Nature laundry, cleaning and bathing products. And the service is fab.
They are currently keeping their usual opening hours:
To check stock if you're after something specific, it might be a good idea to phone ahead (01305 268325) or contact via Facebook: