By Sara Sjolin, MarketWatch

LONDON (MarketWatch) -- U.K. stocks extended gains into a ninth straight day on Tuesday, with Severn Trent PLC soaring after bid news, while miners added pressure after a sector downgrade.

The FTSE 100 index added 0.8% to 6,686.06, the highest closing level since October 2007.

Shares of Severn Trent jumped 14% after the water-utility firm said it received a "very early stage" bid approach, although no proposal has been made.

United Utilities Group PLC tracked Severn Trent higher and gained 2.8%.

Mining firms, however, added pressure in London, after Barclays cut the European mining sector to negative from neutral.

"In the longer term we believe the building blocks that made up the supercycle are gently being removed. Supportive Chinese demographics, investment led economic growth and availability of easy credit, lack of investment in mine supply, and difficulty in bringing it to market are all now either leveling out or reversing," the analysts said in a note.

"In the second half, fear is likely to become reality with [about] 70% of the additional volume of iron ore and copper scheduled for 2013 arriving in the next six months. It is happening when the broader demand picture is deteriorating and Q3 is a seasonal soft time for metals markets," they added.

Specifically, Barclays cut Rio Tinto PLC (RIO) to equal weight from overweight, sending the shares 1.1% lower. Vedanta Resources PLC was also lowered to equal weight, its shares falling 2%. Metals prices were mostly lower.

Shares of platinum producer Lonmin PLC sank 7.3%, after the firm said it suspended work at its Marikana strike after a strike.

TUI Travel PLC slipped 0.9% after J.P. Morgan Cazenove cut the holiday firm to neutral from overweight.

Babcock International Group PLC put on 6.8%, after the engineering support-services firm reported a rise in fiscal full-year pretax profit and said it sees strong progress this year.

BG Group PLC added 3.5% after the energy firm said it is shifting focus back to exploration and liquefied natural gas, while cutting back spending on big developments.

Shares of BP PLC (BP) put on 0.6% and Royal Dutch Shell PLC (RDSB) added 1%, even as both oil firms confirmed their offices had been raided as part of an EU investigation into suspicious price fixing. BP and Shell said they were cooperating with the investigation.

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