From the longer Wikipedia page [1]
Pimlico /ˈpɪmlɨkoʊ/ is a small area of central London in the City of Westminster. Like Belgravia, to which it was built as a southern extension, Pimlico is known for its grand garden squares and impressive Regency architecture.
Tate Britain is in Pimlico. . Served by Pimlico Station and various buses.