Britain's FTSE boosted by oil stocks and housebuilders after UK budget

* FTSE 100 up 0.5 pct

* Osborne announces oil tax changes

* Higher stamp duty rate boosts housebuilders

* Tate & Lyle (LSE: TATE.L - news) , Britvic (Stuttgart: B6S.SG - news) hit by sugar tax (Recasts, adds quote and updates prices)

By Kit Rees and Alistair Smout

LONDON, March 16 (Reuters) - Britain's top share index rose on Wednesday as oil and gas stocks and housebuilders rallied on the back of proposals in UK finance minister George Osborne's annual budget statement.

Britain's FTSE 100 was up 0.5 percent at 6,168.57 points by 1407 GMT, outperforming the broader European market.

As part of his statement, Osborne cut Britain's growth forecast for 2016 and 2017.

"There (are) some big question marks in regards to targets as far as the economy is concerned and being able to turn a surplus," said Alastair McCaig, market analyst at IG (LSE: IGG.L - news) .

Investors, however, were cheered by a reduction of the rate of 'supplementary charge' on oil and gas produced to 10 percent from 20 percent, effectively abolishing petrolem revenue tax.

Britain's oil & gas sector extended its gains, rising 2.7 percent while shares in Royal Dutch Shell (Xetra: R6C1.DE - news) and BP rallied 2.5 percent and 2.7 percent respectively.

Md-cap Tullow Oil (LSE: TLW.L - news) jumped 5.2 percent.

The sector was also buoyed by a rise in oil prices following an announcement that producers will meet next month in Qatar to discuss a proposal to freeze output and on growing signs of a decline in U.S (Other OTC: UBGXF - news) . crude production.

Housebuilders also rose, with traders citing government plans to encourage building of new homes on brownfield land, as well as relief that there were no additional taxes or levies announced for the sector, which is seeing stamp duty on some properties rise in April already.

Barratt Developments (LSE: BDEV.L - news) , Taylor Wimpey (LSE: TW.L - news) and Persimmon (Other OTC: PSMMY - news) all gained between 2.5 to 3.2 percent

Likewise plans to increase the limit on ISA savings accounts gave a boost to personal finance stocks St. James's Place , Hargreaves Lansdown (LSE: HL.L - news) and Brewin Dolphin (LSE: BRW.L - news) .

However, mid-cap company Tate & Lyle, which produces sweeteners, slipped 1.4 percent and soft drinks companies Britvic and A.G.BARR fell 2.4 percent and 4.8 percent respectively after Osborne said Britain would introduce a new sugar levy on soft drinks.

Nichols (LSE: NICL.L - news) , maker of the soft drink Vimto, slumped nearly 10 percent.

Among the fallers, miner Antofagasta (Other OTC: ANFGY - news) dropped 5.2 percent, extending its losses from the previous session after a smattering of target price downgrades after it cancelled its final dividend on Tuesday.

London Stock Exchange (Other OTC: LDNXF - news) was down 0.6 percent after it said it had reached a merger agreement with Deutsche Boerse (LSE: 0H3T.L - news) which could bring potential cost savings of 450 million euros ($500 million) a year for the combined company.

A downgrade by investment bank Citi on tour operators TUI and mid-cap Thomas Cook (Xetra: A0MR3W - news) hit both stocks which dropped 6 and 4.5 percent respectively. (Reporting by Alistair Smout; Editing by Keith Weir)