Interesting post. Hadn't seen the link from ShyTorque before but on looking at it, Genghis's experience from Coventry virtually mirrored one of my own last year.
Flew in to park for a couple of hours for a local meeting, absolutely no help from ATC with parking, total confusion as to where I should shut down. Then on returning waited 15 minutes rotors running to try and get any response from Tower and try and depart, despite booking out properly etc. Eventually had to get forceful on the RT to get out of the bloody place. And no NOTAMs were in force or extraordinary activities in place. In over 20 years of flying I have never experienced such appallingly unprofessional, time wasting, customer uncaring treatment from an airport ATC. I thought it must have been a freak but clearly not.
With such an attitude (and/or hopelessly inadequate ATC resources) the recent proposal for its own CTZ/CTA fills me full of horror. Coventry - if you're listening you really do need to address what do not seem isolated experiences, and even then they should never have happened.