Specialist brick, land development and landfill firm Michelmersh Brick helping the construction and materials sector build gains after it said trading during the first half has been in line with management's expectations and is well placed for 2010 and beyond.Revenues are up at all plants on an equivalent basis despite weather conditions at the beginning of the year, the group said.Top performing sectors so far todayAlternative Energy 4,753.48 +2.81%Life Insurance 3,890.74 +2.77%Automobiles & Parts 3,472.03 +2.41%Mobile Telecommunications 3,577.32 +1.74%Construction & Materials 3,446.81 +1.69%