NMWM05170 | Entitlement to National Minimum Wage: friends and neighbours
From HM Revenue & Customs · National Minimum Wage Manual
The National Minimum Wage does not need to be paid when jobs are done under informal arrangements between friends and neighbours. This is because such arrangements will not normally have the necessary intention to create legal relations between the parties so the person doing the task will not have the status of a worker (NMWM05020) even if a token payment or gift is provided in return.