>>1591843 (old bread)
I'm not familiar with OfComm (British version of FCC for ham radio licensing) but QRZ is a popular site to lookup callsign info (you have to be logged in to see address info). I looked up that M6LKA call in QRZ and didn't get a result.
Here's Nellie Ohr's callsign at QRZ
https://www.qrz.com/db/KM4UDZ
it pulls in her ham radio data from the FCC, which is public record.
here's her FCC data
http://wireless2.fcc.gov/UlsApp/UlsSearch/license.jsp?licKey=3815075