When Gordon Harper arrives in dapper style to celebrate his 90th birthday with friends and dignitaries at the City Hotel next month, it will be a milestone in more ways than one. For Mr Harper is the last surviving former staff member from among those with whom he worked in the original City Hotel on Foyle Street, on the site of what is today the Peace Park. And the years have dimmed neither his wit, his wisdom nor his vivid recollections of his time there.