Northwood is an elevated residential settlement in the London Borough of Hillingdon adjoining Ruislip Woods National Nature Reserve (which contains the Ruislip Lido) and which shares a northern border with Hertfordshire. Northwood's population was recorded as 11,068 in 2008, by the Office for National Statistics and its south-eastern neighbourhood Northwood Hills had a population (in 2001) of 10,833. Northwood was used for location filming of the Goods' and Leadbetters' houses and surrounding streets in the BBC TV situation comedy series The Good Life.