Gardai won't have access to possible UK evidence in the Kevin Lunney case until after an investigation into the death of one of the main suspects.
The man was taken ill and died during a police raid at his home in Derbyshire yesterday.
The raid was part of a major operation across Ireland and the UK into the kidnap and torture of the Quinn Industrial Holdings director.
The incident has been referred to the UK's Independent Office of Police Conduct (IOPC), which has launched an investigation.
Police investigating the assault and abduction of the Quinn Industrial Holdings (QIH) executive carried out major searches on both sides of the border earlier.
Gardaí searched 12 locations south of the border while the PSNI searched five locations in the North.
Nicola Tallant, from the Sunday World, which named Cyril McGuinness as the main suspect in the intimidation campaign against QIH staff five years ago, says gardai are hoping there is vital information in his UK home.
An Garda Síochána continues to appeal to any person who has any information, no matter how insignificant it appears, on this attack or any other criminal activities which have taken place in the Cavan/Fermanagh border area over recent years to contact An Garda Síochána at Cavan Garda station om 049-4368800, the Garda Confidential Line at 1800-666-111, Crime Stoppers on 1800-25-00-25 or any Garda station.