* EIA data shows less demand in November
* Market eyes U.S. economic indicators due later on Monday
* Labour action in Britain, U.S. offer some support (Updates prices, global shares)
By Fayen Wong
PERTH, Feb 2 (Reuters) - Oil fell below $41 a barrel on Monday, as worries over shrinking global energy demand offset support from threats of major strikes by refinery workers in the United States and Britain.
U.S. light crude for March delivery <CLc1> fell 77 cents to $40.91 a barrel by 0932 GMT, after gaining as much as 63 cents in early trade.
London Brent crude <LCOc1> shed 17 cents to $45.71 a barrel.
"The slew of economic and oil demand data which came out of the U.S. last week was all pretty negative energy demand outlook," said David Moore, a commodity analyst at the Commonwealth Bank of Australia.
"But threats of refinery strikes on both sides of the Atlantic are probably giving oil some support."
United Steelworkers negotiators and oil company representatives returned to the bargaining table on Sunday, one day after telling thousands of U.S. refinery and chemical plant workers to stay on the job as they try to hammer out a new national contract. [
]The USW decided on Saturday night to extend the current pact on a rolling 24-hour basis to keep talks going without a nationwide strike.
In Britain, Prime Minister Gordon Brown on Sunday condemned nationwide wildcat strikes over the use of foreign workers, but unions warned more staff may down tools this week. [
]Signs from OPEC late last week that it may augment its record output cuts to stem the collapse of more than $100 in prices, and an abrupt end to a ceasefire in Nigeria's oil-rich Niger delta had also supported prices, analysts said. [
]But fears of a deep global recession and a tumble in world energy consumption continue to unsettle investors.
Global stock markets hit a one-week low and the euro set a two-month trough versus the dollar on Monday as jitters grew about poor economic data and falling corporate profits.
A closely watched euro zone survey showed the region's manufacturing business shrank again, albeit at a slower pace, in January while factory prices fell at their fastest rate in at least six years, leaving scope for more interest cuts from the European Central bank.
BLEAK OUTLOOK
A report from the U.S. Energy Information Administration on Friday showed U.S. oil demand in November was 305,000 barrels per day (bpd) less than previously estimated and was down 1.577 million bpd from a year earlier.
Data also showed U.S. gross domestic product fell at a 3.8 percent annual rate in the fourth quarter, the biggest drop since the first three months of 1982. [
]Bleak economic data from South Korea, which showed its January exports shrinking by a record pace, also raised fears of a prolonged economic recession. [
]Oil markets were expected to closely eye Monday's U.S. economic indicators to gauge how the world's largest economy was faring. Data due to be released include personal income and consumption, construction spending for December and the Institute for Supply Management's January index of manufacturing activity.
OPEC Secretary General Abdullah al-Badri told Reuters on Friday the producer group was willing to cut output further at its meeting in March, adding to agreed cuts of 4.2 million bpd since September to prop up prices [
]. (Editing by Ben Tan)