From Companies House info it would appear that Katherine Rose are Lady Uxbridge's forenames rather than Forename/previous Surname. She was born March 1990. She is listed as Katherine Rose Paget, Lady Uxbridge and she and Lord Uxbridge were directors of a company (as stated in Debrett's database) Wildheart Escapes Ltd (formerly Wildhearts Escape Ltd) which had its registered office address as "Marquess of Anglesey, Plas Newydd, Llanfairpwllgwyngyll, Wales LL61 6DZ". Lady Uxbridge was appointed a director on 28 Aug 2018 though the company was dissolved in March 2020.