Another question for you, why is the airspace delegated to Cardiff when most of the traffic originates from or terminates at Bristol?
Who operates en-rte ATC in the UK? NATS
Who supplies ATC at Cardiff? NATS
Who supplies the infrastructure to allow that delegation (radar, radio etc)? NATS
In addition to which - Cardiff is actually centrally positioned to the delegated airspace, which runs TALGA - Exeter as well as ALVIN - AMMAN