Question: What country are Belgravia, and Knightsbridge are located in?

Context paragraphs:
Sloane Square: Sloane Square is a small hard-landscaped square on the boundaries of the central London districts of Knightsbridge, Belgravia and Chelsea, located 2.1 mi southwest of Charing Cross, in the Royal Borough of Kensington and Chelsea.  The area forms a boundary between the two largest aristocratic estates in London, the Grosvenor Estate and the Cadogan.  The square was formerly known as 'Hans Town', laid out in 1771 to a plan of by Henry Holland Snr.  and Henry Holland Jnr.  Both the square and Hans Town were named after Sir Hans Sloane (1660–1753), whose estates owned the land at the time.

Harvey Nichols: Harvey Nichols, founded in 1831, is a luxury British department store chain with a flagship store in Knightsbridge, London.  It sells fashion collections for men and women, fashion accessories, beauty products, wine and food.

Lowndes Square: Lowndes Square is a residential garden square in Belgravia, London, SW1.  Like much of Belgravia it is characterised by grand terraces with white stucco houses.  The square runs parallel with Sloane Street to the east, east of the Harvey Nichols store and Knightsbridge tube station.  It is home to some of the most expensive properties in the world.  Russian businessman, Roman Abramovich bought two stucco houses in Lowndes Square in 2008 and, once completed, the merged house with a total of eight bedrooms is expected to be worth £150 million, exceeding the value of the previous most expensive house in London and the UK, at £80 million.

Frogner: Frogner is a borough and an exclusive residential and retail district in the West End of the city of Oslo, Norway.  In addition to traditional Frogner, the borough incorporates Bygdøy, Uranienborg and Majorstuen.  The borough is named after Frogner Manor, and the famous Frogner Park is now found on the site of the manor.  In Norwegian society, Frogner occupies a similar position as London's Knightsbridge, and has the highest real estate prices in the entire country.  Most embassies are located in Frogner.

Knightsbridge War Cemetery: Knightsbridge War Cemetery is a war cemetery located in Acroma, Libya, located 750 metres south of the main road from Benghazi to Tobruk, 25 km west of Tobruk.  The cemetery is situated in open country, the Cross of Sacrifice is set high above the level of the cemetery and is easily seen from the road.  The cemetery is reached from a track branching off the main road.

Supporting paragraphs: Lowndes Square Harvey Nichols
Answer: London