The most difficult part of the DIY pricing system is measuring the thickness of a stuffed envelope accurately. This can vary depending how much pressure you put on.
I phoned the Royal Mail on 08456 113113 and they promised to send me a template, presumably it will have a 5mm slot and a 25mm slot in it.
When I asked if it was made of plastic or metal, I was told it was stiff card, so here's hoping it will do the job.
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