Interesting!
These things are nothing like the AERADS that I have seen and not to put to fine a point on it they are rubbish!
Some more research on my part is needed but as I am only working with these things on a short term basis I had not looked into the origin of these plates but I suspect that they are ex-SAS.
In short I can't wait to get back to the Jepps when this contract finishes.