national free school meal (FSM) benchmark data, which ranks a school's performance relative to other groups of schools with comparable free school meal levels. Around 55 percent of schools and local authorities deemed the benchmark data very useful, 35 percent considered it fairly useful, and only about 10 percent regarded it as being of limited use. Additionally, researchers conducting analysis for the London Borough of Lambeth have argued that broad ethnic groupings such as "black African" or "white other" can hide significant variation in educational performance, so they instead recommend the use of language categories. Healthcare The ethnic group categories used in the National Health Service in England are based on the 2001 census. It has been argued that this causes problems, as other agencies such as social services use the newer 2011 census categories. In Scotland, the 2011 Scottish census categories are now used. In 2011, Scotland started to record ethnicity on death certificates, becoming the first country in the world to do so. Ethnicity data is not routinely recorded on birth certificates in any part of the UK. Whether the official UK ethnic group classifications are useful for research on health is the subject of debate. Peter Aspinall argues that the 2001 census categories fail to adequately break down the "white" group and ignore ethno-religious differences between South Asian groups, amongst other issues. Writing in the Journal of Epidemiology and Community Health, Charles Agyemang, Raj Bhopal and Marc Bruijnzeels argue that: "The current groupings of African descent populations in the USA and the UK such as Black, Black African, and African American hide the huge heterogeneity within these groups, which weakens the value of ethnic categorisation as a means of providing culturally appropriate health care, and in understanding the causes of ethnic differences in disease. Such broad terms may not fit with self definition of ethnicity". Collective terms for minority ethnic groups Since the Second World War, many minority groups in the UK were collectively referred to as "coloured", a term which is deprecated and offensive in modern-day usage. From the 1970s until the early 1990s, those who subscribed to the notion of political blackness used the term "black" to refer to all ethnic minorities in the UK; however, this also came under scrutiny in the 1990s, especially from British Asians who did not feel "black". A number of terms have been used, by government and more generally,