As before the stamps sold from Post & Go machines will be overprinted with one of 5 service indicators, producing a further 30 possible combinations. I suspect some collectors will be content with an example of each bird, rather than each value.
A presentation pack will be sold by the Philatelic Bureau with gravure-printed service indicators all 1st class. The 'branch code' is now 002011 rather than 002010. See the rest of the designs and technical information on our webpage.