When the Royal Mail Post and Go machines went to the 85th Scottish Congress at Perth, another software error occurred on machine 3 resulting in the date showing as November instead of April.
The receipts show the date as 11/11/2014 but more importantly the data string shows BNGB14 rather than B4GB14. These were spotted on eBay and it seems that the error was soon corrected. (See here, closing 4 June.)
As readers will know we didn't get any stock of the Perth Congress stamps.
UPDATE 20 May
Thanks to Joachim we can now show a scan with the last stamp with string BNGB14 (session 779; time
13:20:13) and the first stamp with string B4GB14 (session 780; time
ROC ~ Black Print Rooster ATM Labels - Republic of China (Taiwan) Black print Rooster ATM labels with machine code 111, from Keelung post office.