We were unable to give a decent answer to the recent visitor to this site who asked where he could buy Korean books in London. The best anyone could come up with was to try a trip to New Malden. [Update: there’s a Korean bookshop in New Malden which I visited recently. More info here.]
Undeterred, the visitor (from the Czech Republic) did his own research and came up with Grant & Cutler in Great Marlborough Street. He reports that they sell
a few books in Korean language as well as many exercise books and books in English about Korea.
Go try it out.