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I see. So if I did 15hrs/week I’d earn gross £133.65 which would definitely reduce it to nothing.
That isn't clear, the reduction "formula" doesn't appear to be in the public domain. So you would probably need to make a claim to be able to find out.
In 2018...
"• £5 is ignored for single claimants • £10 is ignored for unemployed couples (even if only one partner is working) • £20 is ignored for lone parents, people with disabilities and carers. Earnings above these amounts will reduce your benefit pound for pound"