The same money, one fee comparison
Assume each old scheme's total annual charge, including fund costs, is 0.6%, and a suitable receiving scheme's total charge on the same investment mix is 0.3%. These are illustrative assumptions, not current quotes for these three unknown plans. Nest publishes a 0.3% annual management charge for its own pot, but also levies 1.8% on new contributions; its page says transferred-in money does not incur that contribution charge. Nest's tariff is a benchmark, not evidence that any household's receiving scheme costs 0.3% all-in. Obtain actual all-in charges, including any receiving fund and exit costs, before deciding.
On £20,000 at the starting balance, 0.6% costs £120 a year and 0.3% costs £60: £60 difference at today's balance. The chart shows one year's starting-balance charge, not a forecast or guaranteed saving. If the balances change, the pound charge changes too.