> However, big caveat - it's self-reported. If you look at how many people get disability benefit it's around 10%.

I don't know about the UK, but in the US, in order to get social security disability, you need to have a documented disability and there's also income limits. If you have a disability, but you manage to find a career despite the disability, you'll lose eligibility for social security disability or at least you'll lose the social security payments. Depending on the disabilities in question, I think it's reasonable that 60% of people with a disability can find work that pays enough that they are no longer eligible for a disability payment and/or they've reached the age where they get a retirement/old age insurance benefit rather than disability.