Weaker commodity-related stocks push FTSE to 2-week low

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* Blue (OTC BB: BUES - news) -chip FTSE 100 index closes 0.4 pct lower

* Mining and energy stocks down on weaker metals, oil prices

* Housebuilders feature among top gainers

By Kit Rees and Atul Prakash

LONDON, Aug 22 (Reuters) - Britain's top share index slipped to its lowest level in nearly two weeks on Monday, with commodity-related stocks leading the market lower following a drop in metals and crude oil prices.

The commodity-heavy FTSE 100 ended 0.4 percent weaker at 6,828.54 points after hitting a low of 6,812.07, the lowest since Aug. 9. The index has fallen 2 percent in a week.

The UK mining index fell 2.7 percent after copper hit a five-week low as the dollar gained on hawkish comments from a Fed official and inventories rose. Other industrial metals and gold also fell sharply.

Shares (Berlin: DI6.BE - news) in Anglo American (LSE: AAL.L - news) , Fresnillo (Frankfurt: A0MVZE - news) , Randgold Resources, Antofagasta (Other OTC: ANFGF - news) and Glencore (Amsterdam: GX8.AS - news) declined between 2.5 percent and 5.9 percent.

The oil and gas index dropped 1.5 percent after crude oil prices fell nearly 3 percent as China ramped up exports of refined products, U.S (Other OTC: UBGXF - news) . oil producers added rigs for an eighth consecutive week and prospects emerged for higher exports from Iraq and Nigeria.

"A more hawkish tone from a succession of Fed officials along with a sharp slide in oil prices has seen the FTSE 100 feeling the worst of the declines due to weakness in the mining and oil and gas sectors," said Michael Hewson, analyst at CMC (Shanghai: 600327.SS - news) Markets, referring to the FTSE's underperformance against a flat STOXX Europe 600 index.

"(However) housebuilders have managed to attract some further buying interest. Some of the more bearish sentiment surrounding the UK economy and the housing market appears to be dissipating as a host of economic forecasts dial back their more bearish outlooks for the UK economy."

Shares in housebuilders Taylor Wimpey (LSE: TW.L - news) , Barratt Developments and Berkeley Group gained between 2.5 percent and 3.5 percent.

The shares had fallen heavily following the UK's vote to leave the European Union in June. They have since risen off 2016 lows but are yet to break above their pre-Brexit levels.

"On the one hand you've got the possibility of an economic downturn, but equally you've got really low mortgage rates, and you also have a very large imbalance in the supply and demand of housing ... and that's going to help support property prices," Laith Khalaf, senior analyst at Hargreaves Lansdown (LSE: HL.L - news) , said. (Editing by Robin Pomeroy)