(Updates to market close)

* Admiral Group slips after RBC downgrads stock

* UK gilt yields hit one-week high

* Entain ( GMVHF ) edges up after report co weighing options for its

CEE venture

* FTSE 100 down 0.4%; FTSE 250 down 0.6%

June 19 (Reuters) - UK shares fell on Friday as U.S.-Iran

tensions and political uncertainty dampened risk appetite,

sealing a weekly decline for both blue-chip and mid-cap indexes.

The FTSE 100 ended down 0.4%, at 10,363 points,

losing 1% on the week, the steepest weekly loss since early May.

The FTSE 250 midcap index fell 0.6%, down 0.5% for the

week.

* Miners weighed on the index, with Anglo American

and Rio Tinto dropped 2.6%, each and Glencore ( GLCNF )

declined 1.6%. Precious metals miner Fresnillo shed

about 4.6%.

* Global shares fell, while oil prices got a boost after

Washington and Tehran called off peace talks, which traders had

hoped would ease supply risks around the Strait of Hormuz.

* Meanwhile, Labour mayor Andy Burnham cleared a path on

Friday to ousting British Prime Minister Keir Starmer,

potentially ushering in a new bout of political instability.

* "The strength of his (Burnham's) mandate may determine how

far he might go with anything one might call a market-unfriendly

approach - i.e., higher borrowing, redistributive wealth taxes,

etc," said Saxo UK Investor Strategist Neil Wilson.

* British government bond yields rose to a one-week high

increasing slightly more than those for German debt, after

higher-than-expected borrowing numbers and Burnham's election

victory.

* Energy stocks were the main source of support. BP

rose 2.8% and Shell gained 1.1%, as crude prices ticked

higher.

* The Bank of England held rates at 3.75% on Thursday but

the vote split to 7-2 from 8-1 in April, with two members now

backing a hike. The hawkish tilt pushed gilt yields to a

one-week high.

* British insurer Admiral Group slipped 3.2% after

RBC downgraded the stock to "sector perform" ahead of results.

* Barratt Redrow ( BTDPF ) named former British Airways

finance chief Rebecca Napier as its new chief financial officer.

The homebuilder's shares dropped 1%.

* Reuters reported the Ladbrokes-owner Entain ( GMVHF ) has

begun exploring options for its joint venture in Central and

Eastern Europe, including a possible sale. Stock fell 1.2%.