News: RIO UPDATE 2-FTSE 100 ends worst session in nearly three-weeks as banks, commodity-linked...

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• Sainsbury's gains on beating sales expectations
• Private equity firm Bridgepoint to list on LSE
• FTSE 100 down 0.9%, FTSE 250 off 0.6%

(Updates to close)

London's FTSE 100 marked its worst session in nearly three weeks on Tuesday, dragged down by commodity-linked and bank stocks, while a stronger pound weighed on export-oriented companies.

The blue-chip index .FTSE dropped 0.9%, pulled down by miners .FTNMX551020 , energy .FTNMX601010 and major banking stocks .FTNMX301010 .

Dollar-earnings consumer staples companies Unilever ULVR.L , Diageo DGE.L , and British American Tobacco BATS.L were among the biggest drags on the export-heavy index as sterling hit over a week's high against the dollar.

Britain's 2 trillion-pound ($2.8 trillion) debt mountain is becoming more exposed to inflation and interest rate shocks which are themselves becoming more frequent, Richard Hughes, chairman of the country's budget watchdog, said.

"Inflation woes certainly seem to have gripped UK investors today following a pretty grim report from the government's public spending watchdog," said Danni Hewson, financial analyst at AJ Bell.

"High levels of public debt are more vulnerable than ever to rising interest rates but failure to spend to deal with issues such as Covid scarring and meeting climate targets brings its own costs."

The FTSE 100 has gained nearly 10% so far this year on government stimulus support and record low interest rates but has largely underperformed its European and domestic mid-cap peers and continues to be one of the lowest valued markets.

British online grocer and technology group Ocado OCDO.L slipped 4.2% despite the company saying the demand for its grocery business and technology remained strong after it announced a 20% rise in first-half retail revenue.

Miners including Rio Tinto RIO.L , Glencore GLEN.L , Anglo American AAL.L and BHP BHPB.L fell between xx% and xx% and were the biggest drags.

While oil majors BP BP.L and Royal Dutch Shell RDSa.L fell 4.1% and 2.1%, respectively, tracking weaker crude.

The domestically focussed mid-cap index .FTMC slipped 0.6%.

Among stocks, British supermarket group Sainsbury's SBRY.L rose 0.6% after it beat expectations for first-quarter sales though growth slowed sharply.

Private equity firm Bridgepoint said it would list on the London Stock Exchange to raise 300 million pounds ($417 million) to support its growth plans as the sector revs up.

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