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* FTSE 100 down 0.4 pct
* Miners, energy shares fall
* Ex-divs weigh
* Cobham slumps after results
By Kit Rees
LONDON, Feb 16 (Reuters) - Britain's top share indexretreated from a one-month high on Thursday, weighed down by afall among mining firms and those trading ex-dividend, whilemid-cap engineer Cobham slumped after results.
The blue FTSE 100 index was down 0.4 percent at7,272.58 points, in line with a broader decline among Europeanindexes.
Falls among banks, oil & gas stocks and mining firms were the biggestweights, with shares in Anglo American and Antofagasta falling more than 2 percent as the price of coppereased.
Likewise a number of heavyweight companies dropped aftertrading without entitlement to their latest dividend payout,which included AstraZeneca, BP, Royal Dutch Shell and Imperial Brands, all falling between 1.7 percent to3.5 percent.
British mid-cap stocks, however, saw some dramaticresults-driven moves. Engineering firm Cobham tumbled 20percent and was on track for its worst day on record afterreporting earnings.
Cobham took a 150 million pound sterling charge on atroubled contract with Boeing and downgraded its 2016 tradingprofit again.
Drax Group also fell, down more than 11 percent,after reporting a disappointing set of results, with its coreannual earnings falling 17 percent on weaker power prices andthe loss of revenue from a green energy scheme.
"Because we are in a situation where global economic growthis weaker than it has been ... there is a premium that isattached to growth companies," Laith Khalaf, senior analyst atHargreaves Lansdown, said.
"If those growth companies falter, then you can see a bitof doubt creeping into investors' minds and that can influencethe share price."
However, a profit beat propelled Lancashire Holding's shares more than 9 percent. The property and casualtyinsurer posted a better-than-expected 2016 profit, helped bylower expenses and higher gains in the final quarter. (Editing by Jeremy Gaunt)
