The consumer champion found that an online saver could be 37% better off over a year compared with a branch-only saver. The average rate for instant access savings accounts available in branch is just 0.56%, half of that available to online savers (1.14%), with fixed-rate savings accounts, current accounts and cash ISAs also offering better rates for online savers.
What's more, Which? found a whopping 355% difference between the best online deal for travel insurance and the best in branch deal.
Which? chief executive, Peter Vicary-Smith, said: "Not everyone is comfortable or able to manage their finances online and these people are missing out on the best deals as a result.
"Banks should be more inclusive by offering terminals in branches where customers could access online deals, with some help from staff."
