1. Found a Margaret I East, birth registered 1st quarter 1955 at Durham. Mother's maiden name, BOYD
"England and Wales Birth Registration Index, 1837-2008," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QV7K-CFYQ : 1 October 2014), Margaret I East, 1955; from "England & Wales Births, 1837-2006," database, findmypast (http://www.findmypast.com : 2012); citing Birth Registration, Durham North Western, Durham, England, citing General Register Office, Southport, England
2. Found a Margaret I East married to Peter M Cook - registered at Durham in 2nd quarter 1973.
"England and Wales Marriage Registration Index, 1837-2005," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVFT-P2GZ : 8 October 2014), Margaret I East and null, 1973; from "England & Wales Marriages, 1837-2005," database, findmypast (http://www.findmypast.com : 2012); citing 1973, quarter 2, vol. 1A, p. 831, Durham Eastern, Durham, England, General Register Office, Southport, England.