UPDATE 1-Energy stocks prop up Britain's FTSE in cautious trade

* FTSE 100 up 0.1 pct at close

* Oil price boosts energy shares

* Pound holds at 2-week highs, dollar-earners fall

* U.S.-China trade talks, U.S. politics keep markets subdued (Recasts, adds detail and updates prices at close)

By Kit Rees

LONDON, Aug 22 (Reuters) - Britain's top share index edged higher on Wednesday in cautious trade as investors kept an eye on U.S.-China trade talks and politics in Washington, while heavyweight energy stocks supported the broader market.

The blue-chip FTSE 100 .FTSE index ended the session up 0.1 percent at 7,574.24 points as oil stocks rallied, while the mid cap index .FTMC was flat in percentage terms.

Sterling inched higher to trade at its highest level in two weeks. This kept the pressure on the FTSE's dollar-earning constituents, with big consumer stocks such as Diageo DGE.L , British American Tobacco (JO: SNHJ ) BATS.L and Reckitt Benckiser RB.L all down between 0.3 and 0.9 percent.

The FTSE 100 is down around 1.5 percent this year, and uncertainty over Britain's exit from the European Union has kept investors on edge.

More broadly, Michael Hewson, chief market analyst at CMC Markets UK, pointed to a "cautious backdrop" for markets after U.S. President Donald Trump's former personal lawyer Michael Cohen testified on Tuesday that Trump had directed him to commit a crime by arranging payments to silence two women. were also watching Wednesday's trade talks between the United States and China. company news was thin on the ground, broker changes prompted some price moves.

"Unhelpful to the London market is the fact that not a single FTSE 100 company has issued corporate results or trading updates on Wednesday. News tends to influence trading volumes," said Russ Mould, investment director at AJ Bell.

Though Jefferies analysts kept DS Smith's SMDS.L rating at a "hold", they said they saw a supportive pricing environment and opportunities for further sector consolidation and mergers and acquisitions for the paper and packaging sector.

"We expect the UK-listed packaging names to grind higher over the next 12-18 months," Jefferies analysts said in a note.

Shares in Mondi MNDI.L , which Jefferies called a "long-term quality play", gained 1.4 percent.

Among smaller UK stocks, shares in Grafton Group GFTU_u.L rose 2.3 percent after the building materials distributor gave a half-year update.

"Overall, this looks like a very solid update from Grafton, especially bearing in mind the more cautious update from Travis Perkins (LON: TPK )," analysts at Investec said in a note.