When new stamps were issued for the rate changes in April 2011, the 76p, £1.10 and £1.65 were printed together across the web, the position indicated in the grid-block at the lower left of the sheets:
These were, of course, the M11L versions. Originally printed on 10/01/11 and 11/01/11, further printings were made on 12/05 and 31/08/11, and on 10/01/12 still with the M11L year code. All values exist with these dates.
With the 2012 postal tariffs not yet fixed a further printing, with year code M12L, was printed on 25/01/12. The 76p was soon found and the appearance of the higher values (£1.10 and £1.65) with the new year code was eagerly awaited - but they have not been found. But the increase in rates was delayed from the normal end of March to the end of April 2012, and a further printing seems to have been necessary (there being no country definitives at this rate). [BUT SEE 2 APRIL 2013 BLOGPOST]
The final printing was on 30/03/12 from a new D2 cylinder and was a single-value printing! This was not announced by Royal Mail - indeed their list of printing dates shows this as being from cylinder D1 - and supplies are likely to be in very limited supply.
UPDATE 27 September: We understand that the new printing was ahead of the new tariff for surface mail, which was to have been 76p; but that was increased to 77p so these were not needed. The surprise is, therefore, that ANY have been found at post office branches.
Just to clarify, we have no stock of these cylinder blocks or grid positions. We are keen to acquire them for customers so if you have a PO branch that delays returning withdrawn obsolete stock, do check them out. The only reason to print these was because there was a need at POs so many have probably been used on packets or overseas letters.
ROC ~ Rooster ATM FDC - Republic of China (Taiwan) Rooster ATM FDC, posted on February 23, 2017 from Xansia White Rooster postal agency.