Strict self-employment rules hitting tax office in freelancers hired for benefits scandal - How self-employed workers in Madrid can pay no social security taxes - Stricter self-employment rules causing problems in healthcare - Enforcement of stricter self-employment rules struggling to get off the ground - UK's labour market tsar calls for crackdown on bogus self-employment - Some 250,000 workers at risk with stricter enforcement of false self-employment rules - Mandatory disability insurance for self-employed and freelancers 'not feasible' - Companies and staff not making changes yet to adhere to false self-employment rules - Self-employed about to receive a bill - Self-employed workers struggle to bridge gap in retirement savings