FTSEjumps 4.3 pct as bank plan lifts confidence

* FTSE 100 gains 4.3 percent

* Energy, mining stocks rise on rising commodity prices

* Banks mixed as recapitalisation plans assessed

* HBOS, Lloyds TSB, Royal Bank of Scotland tumble

By Simon Falush

LONDON, Oct 13 (Reuters) - Britain's top share index was up 4.3 percent by midday on Monday, recouping some of last week's heavy losses as a government deal to pump billions of pounds into the troubled banking sector lifted market sentiment.

Oil and mining stocks rebounded strongly as commodity prices recovered and some banking stocks gained but HBOS (HBOS.L: Quote, Profile, Research), Lloyds TSB (LLOY.L: Quote, Profile, Research), and Royal Bank of Scotland (RBS.L: Quote, Profile, Research) tumbled again as investors fretted that moves by the government to take stakes in the firms would limit returns.

By 1106 GMT the FTSE 100 .FTSE had gained 168.9 points to trade at 4,100.9 after falling 8.9 percent on Friday and haemorrhaging 21 percent last week, its biggest fall since 1987.  Continued...