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I assume they're asking Royal Mail very nicely for a solid.
They probably need an extra label printer and someone to stick them on boxes too. I can't picture 220k test boxes in my head but it probably takes up a bit of space including all the Royal Mail Yorks (which they sort into, I'm apparently Home Counties North). If course if they had a distribution centre that had been 90% idle they would be accused of being inefficient.
They issued a statement a while ago. Apparently no shortage of tests, its more that they have reached their cap of delivery capabilities. Shippped 220k test kits yesterday. I assume they're asking Royal Mail very nicely for a solid.