[code] => -5
[message] => DB Error: already exists
[mode] => 16
[debug_info] => INSERT INTO civicrm_uf_match (domain_id , uf_id , uf_name , contact_id ) VALUES ( 1 ,  702 , 'rfenwick@googlemail.com' ,  7582 )  [nativecode=1062 ** Duplicate entry 'rfenwick@googlemail.com-1' for key 'UI_uf_name_domain_id']
[type] => DB_Error
[user_info] => INSERT INTO civicrm_uf_match (domain_id , uf_id , uf_name , contact_id ) VALUES ( 1 ,  702 , 'rfenwick@googlemail.com' ,  7582 )  [nativecode=1062 ** Duplicate entry 'rfenwick@googlemail.com-1' for key 'UI_uf_name_domain_id']
[to_string] => [db_error: message="DB Error: already exists" code=-5 mode=callback callback=CRM_Core_Error::handle prefix="" info="INSERT INTO civicrm_uf_match (domain_id , uf_id , uf_name , contact_id ) VALUES ( 1 ,  702 , 'rfenwick@googlemail.com' ,  7582 )  [nativecode=1062 ** Duplicate entry 'rfenwick@googlemail.com-1' for key 'UI_uf_name_domain_id']"]

SELECT * FROM civicrm_uf_match WHERE uf_name like '%-1';