This is a typical High Street version of Sainsbury's: large enough to do a weekly shop if you needed to, but with slightly higher prices and less choice than you would have in one of the laundry out of town stores. (Whitstable also has one of these). But they have reasonable lines of all fresh food and groceries. There isn't an in-house bakery, but they do have a limited range fresh baked items which are delivered.
There aren't many checkouts, and there was a bit of a queue on my visit, so choose your times. On the plus side, the opening hours (7am-11pm Mon-Sat) are useful. read more