Lord Mayor is the title of the Mayor of a major city. Great Britain is a country and as such doesn't have a Lord Mayor.
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In writing, as 'Lord Mayor', perhaps surprisingly. The title Lady Mayoress is reserved only for the wife of a Lord Mayor. You should address a female Lord Mayor as "Madam Mayor" in conversation. It is considered impolite, certainly in public speaking, to address her just as 'mrs. Smith'.In writing an envelope, you use "Mrs. J.B. Smith, Lord Mayor of Portsmouth".
"The Right Honourable Lord Mayor"
Isaac Penington - Lord Mayor - died in 1661.
Thomas Hayes - Lord Mayor - died in 1617.
John Frederick - Lord Mayor - was born in 1601.
John Frederick - Lord Mayor - died in 1685.
Edmund Wright - Lord Mayor - died in 1643.
James Esdaile - lord mayor - was born in 1714.
James Esdaile - lord mayor - died in 1793.
Edward Barkham - Lord Mayor - died in 1634.