ACMI starts to become more for cost cutting than to provide additional capacity for airlines. Both aspect play significant role however considering most ACMI pilots are contractors without any kind of social and health insurance, no job guarantee, no income tax payment, I believe crewing at least %50 cheaper for ACMI airlines comparing to UK airlines. UK should never allow any type of non UK service providers as long as majority of UK pilots and UK registered aircrafts back to flying. This should be as well natural reflex for any other EU countries as they must protect their own pilot community and airlines against ACMI companies' grey (illegal) way of doing business.