* FTSE 100 down 5.5 pct on week; five-session losing streak
* Domestic banks fall; HSBC up after results
* Lack of outright winner in UK elections weighs
By David Brett
LONDON, May 7 (Reuters) - Britain's top shares slipped back in volatile trade at midday on Friday as uncertainty over euro zone debt contagion and the lack of an outright winner in UK parliamentary elections weighed on stocks.
By 1111 GMT, the FTSE 100 <
> was down 5.81 points, or 0.1 percent at 5,255.18, with domestic banks among the hardest hit. The index is set for a fifth straight day of declines and its lowest close since Feb. 16."Where there's fear and uncertainty markets get damned. There is a tendency for investors to get carried away. That is what makes markets the beautiful instruments they are," said Howard Wheeldon, strategist at BGC Partners.
UK-focused banks were sharp fallers on the FTSE 100, with Royal Bank of Scotland <RBS.L>, Barclays <BARC.L> and Lloyds Banking Group <LLOY.L> falling 2.3 to 3.6 percent.
But the sector was pulled higher by HSBC <HSBA.L>, up 4.1 percent after an upbeat first-quarter trading update. [
]Asia-focused peer Standard Chartered <STAN.L> climbed 2.1 percent.
UK blue chips fell as much as 1.9 percent to 5,160.57 early on Friday before rallying after Liberal Democrat leader Nick Clegg said he believed the larger opposition Conservative party should try to form the next British government after an inconclusive election. [
]It will be the first time no party has had an overall majority in Britain's parliament in over 35 years, potentially hampering the new government's ability to tackle the country's huge deficit.
Outsourcing firm Capita <CPI.L> was the top FTSE 100 faller, down 5.3 percent on concerns over the impact a stalemate might have on future contracts, with Shore Capital downgrading its rating. Peer Serco <SRCO.L> fell 3.1 percent.
WALL STREET AWAITED
U.S. stock futures pointed to a slightly firmer start for Wall Street on Friday, recovering after a plunge overnight which saw the Dow <DJI.L> fall as much as 9 percent at one point in the session before recovering to a 3.2 percent fall as technical trading glitches and Europe's debt crisis knocked sentiment.
Investors will focus on April U.S. non-farm payrolls, due at 1230 GMT, which are forecast to have risen by 200,000, after a 162,000 increase in March, with the unemployment rate seen steady at 9.7 percent.
"The U.S. economy is improving. At the moment any worsening will be seen by markets much more worryingly than they might have done a month ago," said BGC's Wheeldon.
Gains in the mining sector <.FTNMX1770>, which had lost more than 9 percent in the past week, helped prop up the blue chips as some bullish punters went in search of bargains.
Rio Tinto <RIO.L>, BHP Billiton <BLT.L>, Vedanta Resources <VED.L>, Xstrata <XTA.L> and Anglo American <AAL.L> added 1.5 to 4.9 percent. (Editing by Jon Loades-Carter)