In the United Kingdom, only an authorised or licensed insolvency practitioner (IP) may be appointed in relation to formal insolvency procedures.

Quite often IPs have an accountancy background. A few active practitioners are lawyers, but it is not necessary to be qualified as either, as since 1986 there has been a direct entry route to the profession

https://en.m.wikipedia.org/wiki/Insolvency_practitioner

Liquidating a company refers to the procedure in which a limited company is brought to a close by an appointed Insolvency Practitioner (Liquidator).
https://www.companydebt.com/liquidation/

Who is the Official Receiver and what is their role in a liquidation
The Official Receiver (OR) is a civil servant working on behalf of the Insolvency Service, but is also an officer of the court. They respond to notifications from the courts of company liquidations, and administer the initial stages, although they may also be involved throughout the process in some cases.

The OR is accountable to both the courts and to the Secretary of State for Business, Innovation and Skills, and their role varies depending on the circumstances of each insolvent company facing liquidation.

https://www.realbusinessrescue.co.uk/articles/directors-advi...

insolvency administrator means a person authorised to administer the reorganisation or liquidation, including one authorised on an interim basis, and includes a debtor in possession if permitted by the applicable insolvency law;
https://www.lawinsider.com/dictionary/insolvency-administrat...

Very idiomatic term in the USA. Frequently encountered.
Ref.:
Processing LinkTrustee in Liquidation | legal definition of Trustee in ...www.lawinsider.com › Dictionary
Define Trustee in Liquidation. means the Person appointed under Section 13.2 to wind up the affairs of and liquidate the Partnership.