Somebody uploaded some DLR shows on mixclud. I remember listening the irish pirate in 1993. Frequency was around 6221 Khz.
https://www.mixcloud.com/gordon-bathgate/dlr-106-fm-gordon-kelly-30th-april-1993/
https://www.mixcloud.com/gordon-bathgate/dlr-106-fm-gordon-kelly-april-1993/