You need to check things with a multimeter, if you don't have one, or are not happy using one, then all you can try is
1) a different post,
2) a different lead if you can borrow one
then you may need some help, I assume you have switched off and on again all the mcb's and the rcd?
On our old 2008 Bessie 325 on the bottom of the 240v box, in the dark at the back of the wardrobe, were three small black unlabelled rocker switches without covers that were easy to knock off inadvertently. Just check it's not the same for you.
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