Homosexuals make up 1pc of British population
A further one in every 200 people are bisexual, according to the data published by the Office for National Statistics (ONS).
The information collected as part of the new Integrated Household Survey (IHS) means that nearly three-quarters of a million UK adults say they are gay, lesbian or bisexual.
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Hide AdMore than 480,000 consider themselves to be gay or lesbian and a
further 245,000 say they are bisexual.
This is the largest social survey ever produced by the ONS and contains information provided by nearly 450,000 people – the biggest pool of UK social data after the Census.
Nearly all the people asked responded, with the vast majority (95 per cent) saying they were heterosexual. One in every 200 chose "other" and just under three per cent said "don't know" or refused to answer.
The ONS said the highest proportion of adults who said they were gay, lesbian or bisexual was in London and the lowest in Northern Ireland.
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Hide AdThe question about sexual identity was added to the survey last year to provide a fuller picture of British society and to help public sector organisations to monitor their responsibility to provide equal opportunities.
The survey also found seven in 10 (71 per cent) people in the UK identified with the Christian religion, nearly nine out of 10 (89 per cent) belonged to the white ethnic group, and four in five men (80 per cent) and 78 per cent of women considered themselves to be in good health.