update users set timezone='Europe/London' where uid not in (0);
update field_data_field_location set field_location_value = NULL where field_location_value='select';
update field_revision_field_location set field_location_value = NULL where field_location_value='select';
update field_data_field_profession set field_profession_value = NULL where field_profession_value = 'select';
update field_revision_field_profession set field_profession_value = NULL where field_profession_value = 'select';