if a name is registered as a ltd company then u can not use it un less it is your name ie joe blogss wc, u can call your self anything you want but if the name is registered then they can make you change your name and try and sue you, for ruinning there name if you do a bad job, ie if you call your self blue monkey, smash a load of windows, etc, i get a load of hassel for it then i can sue you, if you understand what i am meaning
just call your self simba window cleaning, and stick a pic of simba on ur van