LONDON, April 25 - National Statistics on Wednesday reviseddown the seasonally-adjusted claimant count level of unemployment for Marchby 11,500. NS said the claimant count stood at 983,700 in March as opposed to a previousestimate of 995,200. It also revised down its estimate for the February joblesstotal to 996,700. The claimant count rate for March was 3.3 percent, unchanged from February,and down 0.5 percentage points on a year earlier.