try this...
NATS is privatised, and regulated by SRG - no reduction in safety. Along comes "TechBits Plc" "Excuse me NATS, we have invented a new piece of kit that makes ATC even more safe than it is now. Cost you 50 million pounds."
"Err, no thanks, eat into our profits too much"
What could SRG do about that? Nothing. No incentive to invest, no legislation can insist on it....