The printing process is described as "Lithography, except pane 1 which is gravure", and the printer is identified as Cartor Security Printing. However, we know that Cartor do not have gravure capability, so pane 1 will probably be printed by Walsall, especially if self-adhesive.
I must admit the label confused me - I thought it was the same design as in the 2010 King George V PSB but that was a Mackennal profile of the King, and this is the Downey head.
Now we have images of what I believe are the actual panes, and not only have the values changed, the Machin pane is conventionally gummed. How many stamps will have security features, though - we don't know! Of these, the 5p has been issued with security slits but no overprint but only in self-adhesive form, the 1st class has been issued with overprint in both gummed and self-adhesive form but only the latter has the security slits. The 76p has only been issued self-adhesive, having both security slits and overprint. (I wonder if part of the "cost of production' - the reason for the selling price of these books now being 10% above face - is due to the complexity of the cylinders used for these security features?)
And while we're on the subject of costs - it hardly seems necessary to include two rouletting cutters for the panes which contain the commemorative stamps in this booklet:
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