have NATS/CAA mandated the instalation of the ground based equipment for these systems ? like hell have they.
NATS is a service provider, totally divorced from the CAA, and not the regulator. So it's not up to them to mandate the ground based equipment.
NATS would only fit the ground based kit you talk of for one of two reasons. Either they see a benefit to their service provision (and have the users pay for it through navigation charges), in which case they would have to convince the CAA that the kit they were putting in met safety and regulatory standards, or the CAA decide that providers like NATS must have such equipment as part of their 'licence' to provide ATC services and provide the system specifications.
Neither has happened to date and the former is unlikely to happen with NATS under pressure from the CAA to reduce costs and not increase them. You'll need to lobby ICAO, the European Commission, or the CAA, if you want to push through such a requirement for compulsory ground based equipment. Good luck !!!