If the charger is built correctly, then nothing unusual will happen, and it will work as normal.
If the 3 pin plug is the [UK type G standard](https://www.google.com/search?q=uk+plug+type&client=firefox-b-m&sca_esv=6512afbb6cf57869&udm=2&biw=120&bih=241&ei=vxAtZq2zKOWAhbIPzpK4qAE&oq=uk+plug&gs_lp=EhNtb2JpbGUtZ3dzLXdpei1zZXJwIgd1ayBwbHVnKgIIAzINEAAYgAQYsQMYQxiKBTIFEAAYgAQyBRAAGIAEMgoQABiABBhDGIoFMgUQABiABEi7D1AAWABwAHgAkAEAmAFioAFiqgEBMbgBAcgBAJgCAaACbJgDAIgGAZIHAzAuMaAHqgI&sclient=mobile-gws-wiz-serp#vhid=-IxGIdZ2JVlMgM&vssid=mosaic) then the socket should have shutters over the live and nutral pins these would stop you from plugging in the plug the wrong way because the (longer) earth pin wouldn’t have opened the shutters.
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