Ah - but ex-mil aren't always the same!
Having flown a '10 from somewhere in US/Canada to Turnhouse, dropped off the pax and freight, we were all set to push tits and head back to Brize except that we couldn't get a GAT ATC slot until after CDT would have expired. Get on GSM phone to military radar to arrange OAT "We're busy with an exercise and can't take you...." Told him that yes, he darn well would take us as a scheduled task takes priority over playing little war games. Still refused, so got airborne VFR thanks to the flexible and friendly folk at Turnhouse and set off south under a FIS. Came up on Jock Mil's UHF initial contact frequency and requested RIS, climb etc. Huffy controller eventually agreed. Shame that it wasn't quite good enough to have come all the way back VFR, otherwise I'd have flown us back underneath the airways enjoying the view....
Probably not something which "Thuh" birdseed or other people-tube operators would have been able to get away with for obvious reasons.
Being rude to ATC doesn't help. In my view, civil ATC are notably more 'civil' than some of the abrupt and aggressive military ATCOs - with whom it is often necessary to stand one's ground. The UK has a Gold Standard of ATC; it was always a delight to work them after coming back from certain directions to dear old Blighty!