When we reviewed the RAF customised booklet I mentioned a second booklet was in the pipeline. I now have some more details.
The second customised booklet for RAF Centenary will be issued on 11th May 2018. The booklet will contain 4 x 1st class Machin definitives with the same codes (M18L / MCIL) as the previous RAF booklet of six. Unless they are of a different shade they will not be new stamps as such. The 2 x 1st class special issues, are reprints of the RAF Red Arrows Flypast and RAF Red Arrows Swan stamps.
Customised booklets of six are some of my favourites. They are a little collection in their own right. They are also very popular with a lot of collectors.
A little bit of trivia for you. The Red arrows booklet mentioned above is the 59th booklet in this series. The first (Submarines) was issued on 20 April 2001. This was followed by Punch and Judy 4th September 2001. A third booklet Flags and Ensigns was then released on 22nd October 2001. Seventeen years ! My doesn't time fly?
These three booklets mentioned above (in particular) are still very much sought after and still sell for a nice premium over face. Long may the series continue.