Hi John
Yes, there are still some sequences in the build of the later ferrets, sometimes just 2 or 3 numbers, sometimes much more.
I think the sequences must have been broken up with the export orders. So the build might have been something like say 7 ferrets for MOD contract 6/FV/5135, then 12 for export, then another 13 for 6/FV/5135 and so on. I'm gradually building up the sequences in my register. And pleased to say have helped identify some unknown ferrets from it by working out the shorter sequences. (blowing my own trumpet :-)) I am very careful not to give out mis-information. The job is like repainting the humber bridge though :-)
I saw that 00EC26 was listed on ebay last year, but I don't know who bought it. Hopefully the owner will google the registration and pop up on here.
Cheers
Matt