This is the place to go for your staple teas – Earl Grey, English Breakfast, Ceylon, Nilgiri, Kenya, Keemun – as they sell fairly decent teas and very good prices. The tea won’t be in nice boxes (as in Whittards), or caddies (as in Fortnum), but it will be well priced.
Their teaware section, on the second floor, is vast and very poorly organized. Take the time to browse – they are also well priced, and the selection is one of the largest that you’ll find.