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It turns out that the issues which I have been describing as Perforation 12 (following the listings in Stanley Gibbons esteemed Part 1 catalogue) are not strictly perf 12 after all. I butted a horizontal perforation on one stamp up against a vertical perforation on another and hey presto - they did not marry up.
I am unable to locate one of my perforation gauges in amongst all my stamps and albums etc - tut tut. However, as soon as I come accross one the first thing I will do is to measure the perforation on these stamps and let people know the truth.