British lawmakers want the BoE to "urgently" amend the risk margin in EU insurance capital rules known as Solvency II. This refers to a capital add-on to cover what a third party would need to safeguard policies if an insurer goes bust.

"In our view the calculation in Solvency II is wrong," Bank of England Deputy Governor Sam Woods told parliament's Treasury Select Committee.

The risk margin means that 50 billion pounds worth of insurance liabilities are tied up, he said.

Britain has asked the EU to amend the risk margin but has made no progress.

Meanwhile, UK insurers are shipping out longevity risk to firms offshore via reinsurance contracts to minimise risk margin capital.

"They are allowed to do that, but we don't think it's a sensible arrangement," Woods said.

"We do want to fix that, and I think we will be minded to take that forward, particularly as we haven't got to where we wanted to in Europe on it," Woods said.

Britain is due to leave the EU in March 2019, but is expected to continue applying the bloc's financial rules for a further two years or so until new trading relations are in place.

(Reporting by Huw Jones; Editing by Gareth Jones)

Stocks treated in this article : Aviva, Prudential, RSA Insurance Group