In October we were sent images of extra long strips of Cattle Faststamps produced at Stampex, and these were followed by similar long strips of Robins from the BPMA machine.
Some people suggested that the purchaser had interefered with the machine or that the long strips were produced by collusion with Royal Mail staff at the time. A video has now been loaded on YouTube showing the actual purchase at Stampex, and this is now embedded in the original post - see link above. Proof indeed that these were genuine errors.
UPDATE 9 January: It was not only at Stampex and BPMA that the long strip appeared. Frank has sent this picture of one that he obtained from the Camden Market Christmas Shop:
903. Spectacular New Zealand Post Issue Depicts The Southern Lights. - 🇳🇿 *New Zealand Post *will issue a spectacular set of 6 stamps and 1 miniature sheet on 8 February 2017 on the subject of the Southern Lights. The m...