By Huw Jones
LONDON (Reuters) - 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.
The delay is one of the first warning shots from the EU as UK lawmakers vote later on Monday on a bill that would breach parts of Britain's Withdrawal Agreement from the bloc.
Brussels had said it would grant Britain "time-limited" access to euro derivatives clearing from January to avoid huge disruption to markets as a unit of the London Stock Exchange (LSE) (L:LSE) clears over 90% euro-denominated swaps that are widely used by companies.
The European Commission was due to formally take that decision later this week, 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.
The Commission had no immediate comment.
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 Dec. 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 (DE:DB1Gn)'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.