SH650's desire is for
For airspace to re-designed to permit VFR aircraft to safely enter it.
The CAA has slightly different criteria when deciding how best to allocate what is a very scarce resource. The Transport Act 2000 requires it to "satisfy the requirements of operators and owners of all classes of aircraft" but also to "secure the most efficient use of airspace consistent with the safe operation of aircraft and expeditious flow of air traffic"
Perhaps mindful that to do both might be an impossible task the Act gives the CAA the leeway to meet the requirements in a manner it thinks reasonable with regard to the whole set and generally it does.
The presumption in the UK is for Class G and it is almost inevitable that if you limit the amount of controlled airspace you end up with an awful lot of traffic in what CAS there is and that means your ability to allow other traffic in will be limited.