The widely held belief that 10% of people are gay or LGB has been debunked for a while now. I believe it comes from the Kinsey Report on sexual behavior and most of the report has been challenged at this point or written off but the stats on homosexuality always remained in the zeitgeist mainly due to the gay rights movements in the 70's in the US.
More recently the figure I have heard is 5% or 5-6% but this article from Pink News that appeared on my time line yesterday claims it could be lower.
Now the article heading is that those identifying to be straight in the UK has decreased to 93.2% which means approximate 7% are LGB
However reading the article we get more information first off 5.3% said they "didn't know"
Those identifying as Gay or bi (male and female) is 2% with 0.9 as "other"
Among the younger generation which is more open its 4.2%
Personally I am still sticking ti my 5-6% stats https://www.pinknews.co.uk/2019/01/21/lgbt-statistics-straight-br etc ...