Besides the fact that the meetings of the committees of elected members constitutionally charged with having oversight of these matters have all been cancelled by Reform it is ultra vires for *any* political party to engage contractors to do any work like this without getting a formal decision by the Council (not the party), going through a transparent and challengeable procurement process (been there, done that, it's a ball ache but it's legally required, and rightly), and it would be questionably legal for the council to hand over this confidential data to unaccountable and unelected third parties, however their services are procured.
"To whom it may concern" — 😀!

Reform UK said it was going to do an Elon Musk-style ‘DOGE’ on Kent County Council and these 14 comebacks surely said it best
Reform UK’s love of all things Donald Trump knows no bounds, so it will probably come as no surprise that Nigel Farage’s party has just announced its first ‘DOGE’ audit into Kent County Council, one of the councils it took control of in May’s local elections. Party chairman Zia Yusuf was especially excited to announce […]