Just off the phone to OcUK.
Paraphrase:
A01's were in stock, some A00's may have been shipped by mistake. The label on the outside of the box should specify the revision i.e. if the label does not read Rev A01 then the monitor is not a rev A01.
Legal Standing:
If you ordered a rev A01 monitor and received a rev A00 monitor then contact OcUK asap and inform them of the situation. You are covered by the 'Sale of Goods Act', OcUK will advise how to proceed. If you fail to contact OcUK within a reasonable period of time it will be assumed that you accept the monitor as is.
So, keep what you have or return it and gamble on a rev A01. Sallermas or anyone else with a verified A01, any information you can give on the changes, updates etc would be most welcome.