"Why, yes, you can register an XSS attack as a UK company name. How do we know that? Someone actually did it"

“; DROP TABLE “COMPANIES”;– LTD” and “SAFDASD & SFSAF \' SFDAASF\” LTD“, both of which were exploiting the availability of punctuation marks to put commands into the company name field.

https://find-and-update.company-information.service.gov.uk/company/10542519

THAT COMPANY WHOSE NAME USED TO CONTAIN HTML SCRIPT TAGS LTD