Is it possible that your Corlett research includes Simon Corlett (b abt 1749, Ballaugh) and his wife margaret Garrett (B abt Nov 1758, Ballaugh)? they had a daughter, Margaret Corlett/e who married Richard Steele in 1857 and then migrated to Australia in the same year (arriving January 1858). Margaret was said to have been keen to make contact with a cousin (or other family member) who had previously migrated to Australia. I don't know who that relative was.