I believe so, apart from the one owned by one of your members, Mally, I have yet to see another.
I was speaking to a chap from the Military Museum, Newcastle, whilst at a rally at Elvington years ago. He told me my AEC was rare as they were often withdrawn earlier than the other types, because they were so damn slow. As the body was unsuitable for most civilian work, they were discarded. Apparently this all happened in the 1960's onwards, at a time when preservation was less popular, so along with most many complete examples were lost for good. Seems plausible to me at any rate, or am I just gullible! :-D
My AEC has suffered, it has spent most of the time since being sold at auction in 1984, outside. When I acquired it in 1993, the cab was more holes than I care to recall, all the instruments had been disconnected. so nothing electrical worked, (I had to start her by touching the solenoid wire to the battery!).
In about 1996, I re-panelled the cab, and was lucky enough to meet an ex-army sparky, whilst at the museum where I worked, and he very kindly spent ages sorting the wiring, so at least she would start and charge etc.
Then life and kids took over, and the AEC took a back stage for the next 8 years or so. Only recently have I resurrected her from the farm she resided on, and bent my boss's arm up his back to allow me to bring the AEC down to work to try and get her up to a reasonble level.
I drove her down a couple of weeks ago, causing chaos on the roads, only had two near misses! I worked out that the AEC hadn't been started for nearly 5 years, until recently. I put new batteries on her, checked the oil etc, and first time she fired straight up, amazing, was as though she'd never been laid up.