Britons have the opportunity to get up to £200 free if they decide to switch bank accounts this month. Santander, NatWest and First Direct are among the financial institutions offering these deals but some are only available for a limited time only. Here is a full list of the offerings currently on sale with NatWest, Santander and First Direct, according to Which?: First Direct – £175 bonus for new customers who take out the bank’s 1 AccountSantander – £200 bonus for new customers who take out one of the bank’s range of current accountsNatWest – £200 bonus for new customers who take out either…