Rocked by Ukraine, British stocks have worst week since pandemic began

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* FTSE 100, FTSE 250 mark worst week since March 2020

* Outsourcing firm Mitie drops on antitrust regulator probe

* Several UK firms suspend Russia operations

* FTSE 100, FTSE 250 each fall by 3.5% (Updates to market close)

By Amal S and Shashank Nayar

March 4 (Reuters) - Britain's blue-chip and mid-cap stock indexes recorded their worst week since March 2020 on Friday as concerns over the impact of Russia's invasion of Ukraine deepened.

The blue-chip FTSE 100 .FTSE index ended the session 3.5% lower and was down 6.4% over the week, with precious metal miners .FTNMX551030 , automakers .FTNMX401010 and travel stocks .FTNMX405010 were the main losing sub-indexes.

Russian forces in Ukraine seized Europe's biggest nuclear power plant on Friday in what the U.S. said was a reckless assault, although a blaze in a training building was put out and officials said the facility was now safe.

Banking shares including HSBC HSBA.L and Barclays BARC.L and oil and gas giants Shell SHEL.L and BP BP.L were among the top drags on the FTSE 100 on Friday.

"People are nervous around the Ukraine headlines and nobody wants to own stocks. It's Friday and nobody knows what will happen over the weekend, which adds to the risk averseness," said Keith Temperton, a sales trader at Forte Securities.

The FTSE 100 has erased all gains made this year to trade 5.1% lower as soaring commodity prices after Russia's invasion of Ukraine have stoked global inflation and growth worries.

"It is becoming difficult to remain constructive on risk in the face of the current exceptional uncertainty," Andrea Cicione, head of strategy at TS Lombard, said.

British firms including Marks & Spencer MKS.L , recruiter Hays HAYS.L , supermarket group Sainsbury's SBRY.L and the world's largest advertising firm WPP WPP.L have suspended their Russian operations.

The domestically focussed mid-cap index .FTMC fell 3.5% on Friday and is down 7% in its worst week since March 2020.

Among other stocks, Hammerson HMSO.L gained 1.1% after the mall operator reported a smaller annual loss and a drop in debt levels.

Mitie's MTO.L shares sank 10.6% after Britain's antitrust regulator said it is investigating the outsourcing firm over potential breaches of competition law relating to the tender for contracts to run two immigration removal centres.

Reporting by Amal S in Bengaluru; Editing by Saikat Chatterjee, Aditya Soni and Alexander Smith

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