The Bank of England (BoE) - the central bank of the nation - has said it would like to see more institutions joining the initiative, as just 18 direct members of the real-time settlement system Chaps are currently serving the sterling banking industry.
Speaking in Leeds, Chris Salmon - the BoE's chief cashier and executive director for banking services - said the recent financial crisis revealed the risks that are apparent when not every bank is a direct member of this kind of set-up.
The industry figure noted excessive tiering creates unnecessary potential problems, adding the BoE is to encourage change by speaking to the banks - and their supervisors at the Financial Services Authority - directly.
"But if membership does not increase and tiering continues to be a significant issue for the UK, the Bank may consider recourse to more formal actions," Mr Salmon added.
By Claire Archer