* FTSE 100 down 0.1 pct ahead of key U.S. jobs data
* Miners track weaker metal prices
* BA climbs as debt down, analysts' call
* British Energy falls after EDF walks away from bid
By Dominic Lau
LONDON, Aug 1 (Reuters) - Britain's leading share index had ticked down by midday on Friday ahead of U.S. jobs data as weaker metal and oil prices weighed on commodity stocks, though banks rose after a report said Lehman Brothers may sell mortgage assets.
By 1027 GMT the FTSE 100 <
> was down 4.5 points, or 0.1 percent, at 5,407.4, well off its day's low of 5,359.0. The UK benchmark lost 3.8 percent last month, and is down 16 percent for the year.Miners were the biggest drag on the index, falling along with weaker metal prices. BHP Billiton <BLT.L>, Rio Tinto <RIO.L>, Xstrata <XTA.L>, Lonmin <LMI.L>, Antofagasta <ANTO.L> and Anglo American <AAL.L> were down between 3 and 4.3 percent.
Energy stocks also suffered as crude prices <CLc1> traded below $123 a barrel. BP <BP.L>, Royal Dutch Shell <RDSa.L>, BG Group <BG.L> and Cairn Energy <CNE.L> shed 0.4 to 1.1 percent.
Banks traded higher as investors switched into the sector after cashing in on miners and after the New York Post said Lehman Brothers <LEH.N> is in talks with prospective buyers to sell about $30 billion in commercial mortgage assets and other hard-to-value securities, traders said.
Barclays <BARC.L>, Royal Bank of Scotland <RBS.L>, HSBC <HSBA.L>, HBOS <HBOS.L> and Lloyds TSB <LLOY.L> were all up by between 0.6 and 3.4 percent.
But mid-cap Alliance & Leicester <ALLL.L>, which is being taken over by Spain's Santander <SAN.MC>, slipped 1.5 percent after the bank said first-half profits were almost wiped out due to a 209 million pound hit to the value of risky assets and higher funding costs.
All eyes will be on U.S. non-farm payrolls data due at 1230 GMT for further clarity on the state of the world's largest economy after a surprise jump in U.S. weekly jobless claims and weaker-than-expected second-quarter gross domestic product numbers on Thursday.
"You can expect a little bit of nervousness and slightly low volume until we see the figures," said Tim Hughes, head of sales trading at IG Index.
"It is going to be a weak figure. Sso long as it's not going to be dreadful. Then it's kind of confirmation of the difficult economic outlook going forward rather than anything new and negative."
Economists polled by Reuters estimated that employers cut 75,000 jobs in July after losing 62,000 the previous month.
BA FLIES HIGH
British Airways <BAY.L> reversed earlier losses to top the FTSE 100 gainers, climbing 5.7 percent as analysts point to a reduction in debt and increase in average fare yields detailed in the airline's first-quarter earnings update.
Kingfisher <KGF.L> soared 6.6 percent after Europe's biggest home improvements retailer said it had agreed to sell its Castorama Italy business to Groupo Adeo SA for 560 million euros ($871.9 million) in cash, and would use the proceeds to reduce its debt.
BAE Systems <BAES.L> advanced 3.7 percent despite Europe's biggest defence company posting a 26 percent rise in first-half earnings and saying its full-year results would benefit from strong demand for armoured wheeled vehicles.
British Energy <BGY.L>, however, fell 4 percent after France's EDF <EDF.PA> said it had failed to reach agreement taking over the nuclear power operator in a 12 billion pound ($23.8 billion) deal. [
] (Additional reporting by Michael Taylor and Atul Prakash)