Nearly £200,000 was spent by the UK Government defending two legal challenges to the Northern Ireland Protocol.
One of the cases was brought by unionist politicians and Brexiteers including Traditional Unionist Voice (TUV) leader Jim Allister, former Brexit Party MEP Ben Habib and Baroness Kate Hoey, and the other by a loyalist pastor from Belfast, Clifford Peeples.
The Westminster administration’s legal costs were disclosed in a response to a parliamentary written question by former Labour MP Lady Hoey, who sits as a non-affiliated peer in the upper chamber.
Northern Ireland Office minister Lord Caine said: “The Government has spent £196,567 on fees associated with the legal challenges of Clifford Peeples and Jim Allister and others.”
The Supreme Court unanimously ruled last month the controversial post-Brexit trading arrangements in Northern Ireland were lawful.
The joint legal challenge had previously been dismissed by the High Court and Court of Appeal in Belfast.
Attempts to restore powersharing at Stormont have so far failed because of a boycott by the DUP in protest at the protocol, which created trade barriers in the Irish Sea.
The UK and EU have now agreed the Windsor Framework as a way to cut the red tape caused by the existing arrangement.
However, the DUP has said it will vote on Wednesday against the first aspect of the revamped deal to be considered by Parliament, the Stormont brake, which the Government itself has suggested will be indicative of support for the overall agreement.
The mechanism aims to allow assembly members to flag their concerns about new EU legislation that will affect the region.
While the DUP says the framework has gone some way to address its concerns about the protocol, it says some significant problems remain.