Britain's FTSE joins U.S. midterm rally despite ITV, M&S misses

* FTSE 100 up 1.1 pct

* Persimmon (Frankfurt: 882058 - news) boss to stand down

* Sophos shares collapse over billings forecast

* G4S (Copenhagen: G4S.CO - news) and JD Wetherspoon fall over 10 pct (Adds closing prices)

By Julien Ponthus

LONDON, Nov 7 (Reuters) - UK shares joined a post-U.S. midterms rally with strong gains across sectors despite disappointing trading updates from retailer Marks & Spencer (Frankfurt: 534418 - news) and commercial broadcaster ITV (Frankfurt: A0BLQP - news) .

The FTSE 100 top share index was up 1.1 percent at 1035 GMT, rising broadly at the same pace as other key benchmarks such as the pan-European STOXX 600 or the Euro Stoxx.

Fresh optimism on Brexit talks lifted the pound between 0.4 and 0.5 percent most of the session but the stronger currency, which can act as an accounting drag on British blue chips, was not preventing stocks from rising.

The dollar declined, boosting demand for metals and shares in London-listed miners, after the Democrats won control of the U.S. House of Representatives.

Fresnillo (Frankfurt: A0MVZE - news) , Anglo American (LSE: AAL.L - news) , Antofagasta (LSE: ANTO.L - news) and BHP Billiton (NYSE: BBL - news) were up 3.6 percent, 1 percent, and 1.5 percent respectively.

Among the fallers, ITV posted the worst performance, down 2.7 percent. The broadcaster said an increasingly uncertain economic outlook would take its toll on revenues in the last three months of the year, blunting the impact of a slightly better than expected performance over the year so far.

Sales at Marks & Spencer fell in the first half of its financial year, with demand for clothing and food hit by disruption from the latest attempt to reinvent Britain's most famous retailer.

Its shares gradually limited their losses to 0.5 percent.

Sophos Group (Frankfurt: 2SO.F - news) sank and lost 29 percent of its market value after the cyber security company cut its billings forecast and posted lower-than-expected billings numbers in the first half.

Shares (Berlin: DI6.BE - news) in Britain's G4S tumbled more than 17 percent after the world's biggest security firm said profit would not grow this year. Pub operator JD Wetherspoon was another big loser and fell 13 percent with rising wages hitting results.

Shares in Britain's second-biggest house-builder Persimmon rose 0.5 percent after it said its boss would resign after criticism over his multi-million pound bonus scheme. (Editing by Andrew Heavens and Alexandra Hudson)