In Surrey, Marina and Przemek have two children, eight-year-old Ava and five-year-old Alec. Marina, a qualified accountant, made her money as a City of London banker. She recently gave up her successful career and now runs her own business producing sports nutrition bars for children. Marina works 24/7, and her kids have very busy lives too, with most of their time taken up in extra-curricular activities that cost over £1,000 a month. In Essex, Jade and Dean have five boys, three of whom are under six years old. Dean works nights as an HGV driver. Jade, an accounts assistant who had her first child at 15, recently put on hold her prospects of an accountancy career to concentrate on bringing up her children. During the swap, both families struggle with the money. Marina and Przemek find it hard to survive on the meagre £145 weekly budget, while Jade and Dean don't know what to do with their huge £1,300.