Solicitors say the Skipton 'in breach'
London-based law firm Leon Kaye Solicitors said it had received advice from counsel that customers affected by the move may have a potential claim under the Unfair Terms in Consumer Contracts Regulations.
The group said it had been approached by more than 100 borrowers interested in making a claim.
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Hide AdIt is considering launching a class action in the High Court, while it has also taken up the issue with City regulator the Financial Services Authority and the Office of Fair Trading.
Skipton announced in January that it was increasing its standard variable rate (SVR), the rate customers revert to when their existing mortgage comes to an end, from 3.5 per cent to 4.95 per cent from the beginning of this month.
The group had pledge its SVR would never be more than three per cent above the Bank of England base rate, except in "exceptional circumstances".
A Skipton Building Society spokeswoman said: "If any legal action were taken, we would deal with it through our normal procedures."