All extraditions from the UK to the Republic of Ireland should be suspended amid uncertainty over Dublin’s position on handovers post-Brexit, the High Court in Belfast has heard.

Judges were told Irish authorities wanted to “have their cake and eat it” by seeking a man charged with benefit fraud while staying requests for people wanted in Britain.

Ronan Lavery QC claimed it amounted to a breakdown of the principle of mutual recognition within the EU. Insisting the extradition process must be a “two-way street”, he argued: “The UK has to set down a marker in relation to this case with Ireland or else all of the other EU member states will be at this as well.”

His client, Enda Toner, from Cullyhanna in south Armagh, is appealing an order for his extradition to the Republic. Mr Toner is being sought in connection with 165 allegedly fraudulent job seekers’ allowance claims worth around €34,000.

Detained in Northern Ireland on a European Arrest Warrant last December, he remains in custody pending the outcome of his legal challenge.

Lawyers for Mr Toner centred their appeal on a decision by the Supreme Court in Dublin this year to refer a separate extradition request from UK authorities to the European Court of Justice.

Thomas Joseph O’Connor (51), of Cloughbeirne, The Walk, Roscommon, is wanted in Britain over a £5 million tax fraud. Mr O’Connor claimed extradition could violate his rights as an EU citizen because of the UK’s decision to leave the EU in March 2019.

Legal clarity is urgently being sought from the court in Luxembourg. Up to 20 extradition cases to the UK remain held up, pending the outcome of the referral.

But according to Mr Lavery the Irish authorities were refusing to co-operate with extradition requests. “The principle of mutual recognition has been suspended, it’s broken down. One country isn’t playing ball and there’s no reason why we should extradite our citizens to that country.

Two-way street

“They don’t want to extradite to the UK yet they want us to extradite to the South. They want to have their cake and eat it.”

Asked by Lord Justice Treacy if he meant the UK should not extradite anybody to the Republic of Ireland, the barrister replied: “Yes – not while this is pending. This is a two-way street where we have an extradition treaty with the Republic of Ireland on the basis of reciprocity.”

Referring to the decision taken in Mr O’Connor’s case, he insisted: “The Irish Supreme Court knew exactly what it was doing, and it knew what the potential effect of this might be.”

Stephen Ritchie, representing the authorities in Dublin, countered that there was no legal impediment to Mr Toner’s extradition. “It’s not a lack of co-operation or refusal, what the Republic of Ireland is doing is asking for direction from the European Court of Justice on this point.”

Reserving judgment on the appeal, Lord Justice Treacy pledged to give a decision within weeks.