While in some countries a recognised qualification is mandatory for an individual to register as a tradesman or builder, in others it is not the case. In the absence of a regulator in these markets a number of private companies have been set up to screen contractors and ensure that they are suitable for the their advertised services. Many trade occupations in the UK are loosely called engineers; some examples: an aircraft riveter may be called an aeronautical engineer, an automotive car mechanic may be called an automobile engineer or a TV satellite dish installer may be called a satellite engineer, an electrician may be called an electrical engineer.