UK disposable income dropped 9 pct in Feb-Asda

LONDON, March 30 (Reuters) - The average British household had 131 pounds ($186) a week of discretionary income in February, down 9.2 percent on the year and the lowest monthly value since grocer Asda starting tracking data in April 2006.

Britain's second-biggest grocer, which is owned by U.S. retail giant Wal-Mart (WMT.N), said on Monday the average family was 13 pounds a week worse off than in February 2008 due to a sharp drop in earnings growth caused by a plunge in bonuses.

Discretionary spending was also squeezed by a rise in prices following the January sales and the ongoing effects of sterling depreciation raising the cost of imported goods, it said.

Discretionary income is defined as the amount of cash consumers have to spend after covering their food, utility, housing and other basic living costs.

(Reporting by Mark Potter; Editing by David Cowell)