Alan Greaves' widow Maureen has said that "justice has been done for the actions taken for the murder of an innocent man".
Speaking outside Sheffield Crown Court, after Ashley Foster was convicted of manslaughter, she said: "I am greatly satisfied and relieved at the result of the court today however no sentence will bring Alan back".
Mrs Greaves added that her husband "would not want any of us to hold on to feelings of hate and unforgiveness".
More top news
The German bomb - a 500kg device - was spotted by a barge carrying out dredging works, the Royal Navy said.
The study found children born in the 1980s have found it much harder to build up wealth in housing and pensions as they age.
The singer ended speculation over who would perform by saying "the rumors are true" to her 63 million Twitter followers on Friday morning.