Martin Lewis has explained how to get up to £200 “free cash” by switching banks.<br /><br />Breaking offers down into top “upfront”, “service” and “ongoing reward” deals, he named four banks that Britons should consider changing to.<br /><br />The MoneySavingExpert said NatWest and Royal Bank of Scotland are offering the best upfront deals, while First Direct is his top “service” pick and Halifax has the best ongoing rewards.<br /><br />“Most people say it’s easy and hassle free,” Lewis said of switching banks.