UK Stocks-Factors to watch on Sept 15

Sept 15 (Reuters) - Britain's FTSE 100 .FTSE index is seen opening flat on Monday, with futures FFIc1 largely unchanged.

* S4 CAPITAL: Martin Sorrell's ad group S4 Capital cut its annual forecast for the second time this year after flagging continued caution among clients limiting marketing spend amid ongoing economic uncertainty.

* AO WORLD: British electronics retailer AO World AO.L raised the lower end of its adjusted pre-tax profit range for fiscal 2026, supported by robust growth in its business to consumer operations.

* IG GROUP: British online trading platform IG Group IGG.L said Chairman Mike McTighe intends to step down by the end of 2025.

* ASTRAZENECA: Britain's biggest company AstraZeneca AZN.L has paused a planned 200 million-pound ($271.3 million) investment in its Cambridge research site, a spokesperson said, the latest drugmaker to pull back on its business in Britain.

* SAINSBURY'S: British supermarket group Sainsbury's SBRY.L said it has terminated talks with Chinese e-commerce giant JD.com over selling the Argos general merchandise retailer.

* NUCLEAR DEAL: Britain and the United States will sign a deal to work together on boosting nuclear power during U.S. President Donald Trump's state visit this week, the British government said.

* US INVESTMENT: The United States and Britain will announce agreements on technology and civil nuclear energy during U.S. President Donald Trump's unprecedented second state visit this week.

* HOUSE PRICES: Asking prices for homes put up for sale in Britain this month showed an annual decline for the first time since January 2024, while average rents increased at the lowest annual rate in four years, two industry surveys showed.

* OIL: Oil extends gains after attacks on Russian energy facilities

* METALS: Base metals rangebound with focus on Sino-US trade talks, Fed rate moves

* GOLD: Gold prices were little changed as investors awaited a widely expected Fed rate cut.

* For more on the factors affecting European stocks, please click on: LIVE/

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($1 = 0.7372 pounds)