Thanks again. Yep lots of knowledge re Mariners certificates BUT two of us for 3 years have still to pin him down. Only managed to ascertain that the John Pool who (rarely) appeared on census was he as ALL 3 boats were registered Sunderland. Hopefully we can get a crew list (1 may be in Nat Archives - the others St.John's, Newfoundland - maybe). Could not trace him last time at Nat Archives and T & W little info in this respect. He was around 67 so maybe he had another family in another port - but that will never be known. The man is an enigma.