What is the date of vacancy when the date of appointment is 28 november 2007 and replaced by is alex mcleish?
create table table_10592536_8 (date_of_vacancy varchar, date_of_appointment varchar, replaced_by varchar, PRIMARY KEY (date_of_vacancy))
select date_of_vacancy from table_10592536_8 where date_of_appointment = "28 november 2007" and replaced_by = "alex mcleish"