javelin.. I think you will notice that the transmissions from many towers - Gatwick, Heathrow, etc., are superb. They used to be good when Heathrow Approach was at the tower building. When we moved to West Drayton Open Prison we had many complaints from crews and those of us able to listen "from the outside" confirmed that the transmission quality was nowhere near as good as from Heathrow. This point was made to the various authorities but some telecommunications "experts" probably wrote us of as "ATCOs - they don't understand". Unfortunately they were wrong! I do not know current progress.
ATC transmissions from the state-owned units were always first-class but, sadly, they're not much cop now. Mind you, there's an airfield I know where the AFISO would achieve more if he learned CW - the R/T is appalling!