Some Virgin Money customers feel disadvantaged as Nationwide borrowers are offered better mortgage deals, despite both being part of the same group.
After Nationwide acquired Virgin Money, the brands operate separately and customers cannot easily switch between the two for better deals.
Nationwide gained a £2.3bn benefit from the acquisition, allowing them to provide windfalls to members, while both brands offer different mortgage rates to customers.
Customers with expiring fixed-rate mortgage deals are concerned about potential payment increases when switching to new products, but like brands within the same group, they cannot switch seamlessly.