And how do they do that?
By paying their staff absolute peanuts and treating them like crap. I worked for them recently and still have many colleagues who do are they are one of the worst companies any of us have ever worked for. They will win contracts though as they can bid for them cheaply, but if you want staff who enjoy doing the work and will make an effort to get the job done correctly don't use them as they have no motivation or job satisfaction!