The European Union is set to delay a decision on allowing clearing houses in London to continue clearing euro transactions for EU-based clients due to Britain's plan to breach part of the Brexit divorce settlement, a derivatives industry source said.
Brussels had said it would grant Britain "time-limited" access to euro derivatives clearing from January to avoid huge disruption to markets.
A unit of the London Stock Exchange (LSE) clears over 90% euro-denominated swaps that are widely used by companies.
The European Commission was due to formally take that decision tomorrow, but is now expected to delay it until around the end of the month, the source said, citing an industry meeting late last week with a European Commission official.
Before the Commission can take a decision it must first hold a five-day consultation with EU states, the source added.
A Commission spokesman said the consultation was launched on Monday to begin the adoption processs, in line with what it announced in July in its Brexit readiness announcement.
The delay was linked to Britain's perceived unpicking of the Withdrawal Agreement it signed with the bloc, the source added.
Britain left the EU in January and transition arrangements that still allow unfettered access to the bloc end on December 31.
Without legal certainty of access to the EU, the LSE's clearing unit LCH must give its clients in the bloc three-months' notice to move billions of euros worth of swaps positions out of Britain.
Euro clearing has long been a battleground between Britain, to keen to preserve London's clout as a global finance hub, and EU policymakers, who believe the bulk of activity should reside in the euro zone under the eye of the European Central Bank.
But moving large swaps positions from LCH to rivals such as Deutsche Boerse's Eurex in Frankfurt in a short time would be costly for banks and unnerve markets.
Brussels had therefore opted to allow more time for this to happen, although it had not said how much time.
If Britain's bill to override parts of its Brexit divorce settlement becomes law it could sour its attempts to have access to other financial activities in the bloc such as trading shares.