After Brexit, British banks seek delay in splitting off retail business

(Repeats story published late on Monday)

* Banks first want to see if UK retains single market access

* Executives uncertain on how to treat continental businesses

* Non-UK customers could lose protection of the ring-fence

* British banks preparing for Easter 2018 roll-out of scheme

By Lawrence White and Sinead Cruise

LONDON, Aug 1 (Reuters) - Big British banks are lobbying regulators for more time to carve out their retail lending from riskier parts of their business, saying Britain's decision to leave the European Union has made the separation more complex and costly.

Lenders are required to complete the so-called ring-fencing of retail operations by the start of 2019. The initiative aims to avoid a repeat of the 2008 financial crisis, when banks' bad trading bets threatened to sink ordinary depositors and mortgage borrowers, leading to massive taxpayer-funded bailouts.

But the UK regulation - which also covers the European operations directly owned by British banks - was proposed in 2011, when there was no prospect of Britain quitting the bloc.

Since the Brexit result on June 24, several leading banks have told regulators that they first need to find out whether Britain will retain access to the EU single market, and how much access, before reorganising their businesses in such a significant way, according to senior sources at the lenders.

The point of concern, they told the Bank of England's Prudential Regulation Authority (PRA), is how to treat retail operations in the Republic of Ireland and other EU countries.

Some banks do not know if they will be able to retain these businesses at all post-Brexit, or what level of service they will be able to offer customers, said the sources who declined to be named as the discussions with the regulator were private.

This hugely complicates the process of separating their businesses into two banks with individual risk appetites, customer bases and funding costs, according to the sources.

"A delay would be common sense ... we are all building (the ring-fence) but we don't know what environment we're building it for," said a senior source at one of Britain's top five banks.

The PRA declined to comment

If the uncertainties meant continental businesses would have to remain outside the ring-fence, this would expose European savers and home loan borrowers to the risks the plan was designed to shield British customers from, the sources said.

BILLIONS

Much of the Brexit talks, when they come, are likely to boil down to a trade-off between Britain's controls on immigration and its access to the EU single market.