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Driving home last night there was a piece on the radio that was covering recent research that 320,500 self-employed people in the UK are working two or more jobs.
I think it's likely to be a lot more than that but the report, by the Association of Independent Professionals and the Self-Employed (IPSE), is probably covering a particular section of society because it also goes on to state that 7% have also gone on to launch additional businesses. (There are some decent resources on their website if you're thinking about being a contractor IPSE)