Yes Nev, that information is available. But it may not help because the apparent first and last number for a particular year is unlikely to be accurate since Ariel allocated the frames at random.
I have visions of a pile of frames, all stamped with numbers in advance, from which frames are drawn to build bikes as necessary. While the drawing of frames from the pile might be at a fairly constant rate, from time to time a new heap of frames is added to the pile and so these are used before the ones underneath. It is not uncommon for frames with numbers over 3000 different to be adjacent entries in the despatch books. The despatch books are listed by engine number.
Hence asking the Archivist to locate your bike by the frame number can very easily mean asking him to spend a whole morning or afternoon on this particular request, especially if frames are common to different models when it may be necessary to search the book for the 250cc bikes, then the book for the 350cc bikes, then the one for the 500/600 singles, then the one for the OHC fours.....
This is why the Archivist job used to take me 2 to 3 full days work per week, and why I try to avoid the current Archivist being subject to anything other than the most vital work - which usually amounts to getting someone's bike registered again for use on the road.
36 4G, 37 VH, 53 ex ISDT KHA (project), 54 KH(A), 54 4G Mk IV (project), Healey 1000/4 (project)
Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser.