Former Governors-General
Former Governors-General are usually styled ‘The Most Honourable Sir’. They would not however, be styled as ‘His/Her/Your Excellency’. The formal Mode of Address is in:
Writing:
                        The Most Honourable Sir Howard Cooke, ON, GCMG, GCVO, CD
Address
Opening Salutation:
Â
‘Dear Sir/Madam (formal)               Â
Â
……………………………………………………..
Yours faithfully (formal)
Yours sincerely (semi-formal)
Signature’
His wife is referred to as ‘The Most Honourable Lady Cooke’.
Writing:
            The Most Honourable Professor Sir Kenneth Hall, ON, GCMG, OJ
Address
Opening Salutation:
            ‘Dear Sir/Madam (formal)               Â
Â
……………………………………………………..
Yours faithfully (formal)
Yours sincerely (semi-formal)
Signature’
His wife is referred to as ‘The Most Honourable Lady Hall’.
Widows of former Governors-General would be referred to in the same manner.