The aerospace and defence is lower today, with high tech group Cobham bearing the brunt of the attack.Cobham said its commercial markets remain stable, but fragile, with some US customers still reluctant to put pen to paper.Elsewhere in the sector though, Rolls-Royce has moved slightly ahead after picking up a $200m order for Trent 700 engines to go into Tunisair's three Airbus A330 aircraft.Lloyds has given the banking sector a lift after unveiling Antonio Horta-Osorio, the head of Spanish bank Santander's UK business, as its new chief executive replacing Eric Daniels who is stepping down. Top performing sectors so far todayAlternative Energy 3,214.93 +4.07%Banks 4,966.88 +1.75%Industrial Transportation 2,397.87 +1.44%Insurance (non-life) 1,549.16 +1.33%Fixed Line Telecommunications 2,114.76 +1.15%Bottom performing sectors so far todayAerospace and Defence 3,395.03 -2.14%Software & Computer Services 664.90 -1.48%General Retailers 1,743.10 -1.39%Food & Drug Retailers 4,932.08 -1.23%Automobiles & Parts 4,028.49 -1.15%