FTSE bounces back 6 pct on banking bailout

* FTSE 100 gains 6 percent

* Banks gain as recapitalisation lifts flagging confidence

* Energy, mining stocks rise on rising commodity prices

By Simon Falush

LONDON, Oct 13 (Reuters) - Britain's top share index surged 6 percent early on Monday, recouping some of last week's heavy losses as a government plan to pump billions of pounds into the troubled banking sector lifted flagging sentiment.

By 0736 GMT the FTSE 100 .FTSE had gained 236.3 points to trade at 4,168.3 after falling 8.9 percent on Friday and haemorrhaging 21 percent last week, its biggest fall since 1987.

Banks gained after the British government said it would make capital investments worth 37 billion pounds ($64 billion) in RBS (RBS.L: Quote, Profile, Research) and a merged Lloyds TSB (LLOY.L: Quote, Profile, Research) and HBOS (HBOS.L: Quote, Profile, Research). The FTSE 350 banks index .FTNMX8350 surged 7.6 percent.

Lloyds gained 11.4 percent after it said it had renegotiated its agreed takeover of rival HBOS, dropping its offer to 0.605 of a Lloyds share for every HBOS share, down from the 0.833 agreed on Sept. 18.  Continued...