* Insurers bounce back; UK's Prudential up on results
* Defensives, notably drug stocks, cold-shouldered
By Farah Master
LONDON, March 19 (Reuters) - Britain's leading share index rose more than 1 percent by midday on Thursday, buoyed by Federal Reserve plans to buy bonds which boosted Wall Street overnight and propelled gains in banks and heavyweight miners.
By 1125 GMT, the FTSE 100 index <
> had risen by 43.66 points to 3,848.5 after closing 1.4 percent lower on Wednesday, having snapped a six-session winning streak on Tuesday.The U.S. central bank said it would buy up to $300 billion worth of longer-term U.S. government debt over the next six months and expand purchases of mortgage-related debt to help ease credit market conditions in its latest initiative to lower borrowing costs. [
]"They (the Fed) are obviously using every tool available and now they are embarking on a relatively high-risk strategy." said David Scott a strategist at Redmayne-Bentley.
"Bearing in mind that yesterday was one of the first serious selloffs we have seen in over a week and a half, it's inevitable the market would bounce a bit."
Banks responded positively to the Fed action with the sector showing large gains.
Lloyds Banking Group <LLOY.L> and Barclays <BARC.L> led their peers, rising 22 percent and 14.5 percent respectively.
Heavyweight HSBC <HSBA.L> reversed earlier losses to trade 5.5 percent higher. The new shares created by HSBC's 12.5 billion pounds rights issue begin trading in London on Friday and in Hong Kong on Monday.
Standard Chartered <STAN.L> and Royal Bank of Scotland <RBS.L> respectively gained 8.6 and 8.2 percent.
RBS is selling its retail and commercial banking business in Singapore but will keep its investment banking and wholesale business, the Business Times quoted RBS's chairman as saying. [
]Miners found support as copper prices hit 4-month highs on optimism about the Fed's plans, with Rio Tinto <RIO.L>, BHP Billiton <BLT.L>, Anglo-American <AAL.L> and Xstrata <XTA.L> adding between 4.9 and 12.9 percent.
Gold miner Randgold Resources <RRS.L> was up 11.7 percent.
Oil majors rebounded from early falls, impacted by a Morgan Stanley sector downgrade, after crude prices <CLc1> rebounded. Royal Dutch Shell <RDSa.L>, BG Group <BG.L> and BP <BP.L> rose between 0.7 and 1.7 percent.
INSURERS GAIN
UK insurer Prudential <PRU.L> was a strong riser, up 20 percent after it reported an above-forecast 17 percent rise in annual profit, boosted by growth in its Asia operations, and announced the departure of Chief Executive Mark Tucker.
Other insurers recovered after falls on Wednesday, with Aviva <AV.L>, Friends Provident <FP.L>, Legal & General <LGEN.L> and Old Mutual <OML.L> up between 5.9 and 18.3 percent.
Upbeat trading news lifted transport companies; FirstGroup <FGP.L> added 16.6 percent, while tour operator Thomas Cook Group <TCG.L>, gained 7.4 percent.
Pharmaceutical companies were the main drag on blue chip sentiment as investors moved out of defensive sectors, with GlaxoSmithKline <GSK.L>, AstraZeneca <AZN.L> and Shire <SHP.L> down between 2.1 and 4.8 percent.
Defence and household stocks also fell, with BAE <BAES.L> Systems down 2.9 percent and household products firm Unilever <ULVR.L> 2.5 percent lower.
(Reporting by Farah Master; editing by John Stonestreet)