Made mine a partner. It only costs a phone call to hmrc. Then the profits go to each 50/50 on the form. You get double the tax free allowance and costs you nowt. Just two tax returns.
My mate employed his wife a few hours, she doesn't even work with him. But then made her a partner, you can legitimately pay her half and get the tax free allowance even if she doesn't work and just sits at home, as a partner she can still have half the profits. That's 6k extra you won't be taxed on.