New_WO1,
The following link gives some insight into equivalent rank status:
http://encyclopedia.laborlawtalk.com..._officer_ranks
Particularly:
A Warrant Officer in UK service is a senior non-commissioned rank not comparable to the various grades of Warrant Officer in the US, although holding the Queen's Warrant and with certain privileges similar to those of officers. In the Army and Royal Marines, they are referred to by their appointment, of which there are many (for example, Regimental Sergeant Major is a WO1 appointment). The US rank is held by single track career specialists (ranking between Enlisted Ranks and 2nd Lieutenant) and have no NATO equivalent. An RN Warrant Officer Class 1 incorporated the former rank of Fleet Chief Petty Officer.
So, as neither fish nor fowl, it is perhaps hardly any wonder that your status is a mystery to the rest of NATO?