Thanks to the litigious nature of people in the USA that has spread to the rest of the world, it all boils down to ass covering The CAA along with NATS have been discussing with their legal department's as to what services (if any) that ANSP's can provide without leaving themselves open to legal problems in the event of any incidents. Also this being an un-precedented event means there is bound to be chaos and uncertainty amongst all parties involved, lets just hope it doesn't continue for another 12 months.