Between May 17 and June 27, 2018 the branches in Beccles, Thetford, Gorleston, Holt, Hunstanton and North Walsham will close following a decision by parent company RBS to shut 197 NatWest outlets nationally. Transactions in NatWest Helston branch have reduced by 39 per cent since 2012 with now only 68 customers visiting the branch on a weekly basis.
Royal Bank of Scotland will close 259 branches and cut 680 jobs to reduce costs and encourage customers to use online and mobile services, Reuters reports.
Unite, the UK's largest union, representing staff across RBS, accused the taxpayer backed bank of decimating its branch network and betraying communities.
"The way people bank with us has changed radically over the last few years: since 2014, the number of customers using our branches across the United Kingdom has fallen by 40 per cent".
The group said it was "committed to ensuring our customers and communities are able to continue accessing high quality banking services", pointing to its fleet of mobile branches and contract with the Post Office.
It said more than five million customers now used its mobile banking app and one in five only bank with RBS digitally.
The bank, which is still still 72 per cent owned by the taxpayer, has blamed the cuts on customers moving to bank online or on mobile.
RBS insisted it is providing customers with "more ways to bank than ever before".
"It shows the depth of RBS's lack of understanding of island circumstances that their email announcing the branch closure stated there are still "a number of free to use cash machines in your area", before listing cash machines some 27 miles away in South Uist, which people in Barra would have to take a ferry to use".
Last week, the Government disclosed 2018/19 plans to sell around two-thirds of its RBS stake, which would equate to about £15bn over five years.
But it still expects to report an annual loss for 2017 - its tenth in succession - as it faces an imminent fine from the US Department of Justice over its sale of toxic mortgage bonds in the run-up to the crisis.