Security Machins - re-arrangement in our shop

When the first tranche of security stamps was issued in 2009 it was quite easy to make them available in our online shop - though even then some Gibbons catalogue numbers have since been changed.

With the 2010 versions stuttering out in groups or singly, allocating numbers in our stock was erratic.  And some people found some of their own, so needing 'sets' to be broken.

Update
By mid-2011 with the publication of Stanley Gibbons Concise catalogue, which had new numbers for most of the security stamps, our number allocation was changed once again - our new permanent numbering system is shown in this blogpost.