A UK national has been remanded in custody after gardaí seized about €1m worth of heroin following raids in Dublin and Meath at the weekend.

Searches were carried out in a joint operation involving members of the Garda National Drugs and Organised Crime Bureau and the UK's National Crime Agency.

Seven kilos of heroin were recovered while three men were arrested and held at Dublin garda stations.

Kuldip Singh, 55, from the Birmingham area, in England, was charged in relation to the seizure and appeared before Judge David McHugh at Blanchardstown District Court today.

He made no application for bail.

Mr Singh, who also had an address at The Hollows, Spawell, Dublin, was charged with two offences under the Misuse of Drugs Act, for possession of heroin, and having it for the purpose of sale or supply.

The offence is alleged to have taken place on Saturday at a B&B in south west Dublin.

Detective Garda Gavin Curran told Judge McHugh the accused was charged last night at Clondalkin Garda Station.

Mr Singh replied, "I had no knowledge of the drugs" after he was charged, the court was told.

Defence solicitor Wayne Kenny told the judge his client was reserving his position in relation to bail.

Mr Singh remained silent during the brief hearing.

An application for legal aid was made and Mr Kenny furnished the court with a statement of his client's means.

Judge McHugh asked Detective Garda Curran if he was satisfied with the statement of means. He replied: "So far, yes."

The judge asked him if his answer was "conditional or absolute"; the detective said, "conditional".

On that basis, the judge held that he was not going to grant legal aid without supporting documentation.

Mr Singh was remanded in custody to appear at Cloverhill District Court next Tuesday.

One man, in his 40s, was released without charge, with a file being prepared for the Director of Public Prosecutions.

Another man remains in garda custody.