Can't say I've really noticed a difference in the R/T. I fly near Doncaster which is CAS and Humberside which isn't and have done IA's at both, plus at my own airfield which is mil and I'd be hard put to think of a difference, other than I can get a PAR at my own place besides the usual ILS, NDB etc.
It might be an idea if you know you're going to do an IA to let them know before hand rather than just pitch up and ask for one, at least they'll know you're coming; I take it you'll be flying IFR on the way.
Edit: If you're doing an IA in VMC then please take a safety pilot or at least a passenger who can spot other a/c.
Last edited by thing; 19th Jun 2013 at 21:38.