The second retail booklet will be issued on 20 February 2014 containing the stamps of John Charles (Wales) and Dave Mackay (Scotland).
At one time Royal Mail said that this booklet would be issued in Autumn 2013 so
UPDATE 27 January:
These special postmarks are available for the booklet, which is issued on the same day as the Classic Locomotives of Wales miniature sheet. Stampex postmarks will also be available.
Ref 13040 - Swansea - available from Wales & West SHC
Ref 13035 - Edinburgh - available from Scotland and N Ireland SHC, Tallents House
Ref 13033 - Birmingham - available from Midland SHC