Barring any last minute surprises we now have a complete list of Machin definitives issued or first available during 2016. The surprise change in colour of the red stamps has boosted the total with 2016 codes to 39 - and there remains the possibility that the counter two sheet stamps might also appear in the darker colour, and any of the counter sheet stamps may have been printed by De La Rue on security backing paper, if their earlier problems have been resolved.
These stamps have been incorporated into the comprehensive Norvic Philatelics Security Machin Checklist. The current version can be downloaded from Dropbox.
i seem to have 1 more of the 2015 security machins printed on SBP than you do.
it is the 1st class large business sheet with MBIL MA15 printed on SBP.
I believe that 2933.6 (2nd Large from books of 4) is on SBP. I think this also has an impact on the booklet numbers: RA2d.6 should be RA3 and your RA3 (new Chevin font) should be RA4.
You may well be right; since my return I haven't had a chance to fully check Gibbons magazine listings.
It's all been a bit complicated this year, hasn't it? !