IN digging into this I found that of the old 'system' for tagging for review we have the following tags in our system:

`SELECT tag.id, tag.name, count(et.id) as c FROM civicrm_entity_tag et RIGHT JOIN civicrm_tag tag ON tag.id=tag_id WHERE tag.name LIKE '%reviewed%' AND tag.id < 30 GROUP BY tag.id ORDER BY c DESC;

7 rows in set (2.62 sec)

In other words the 6 manual tags are not being used while around 10million contacts are tagged with Quick autoreviewed

I checked our codebase and we are not still assigning these tags & only 4 have been added since we turned logging on (presumably by user accident)
select * from log_civicrm_entity_tag WHERE tag_id =17 AND log_action = 'Insert' ORDER by log_date DESC LIMIT 10\G

ERGO I feel pretty confident doing the following

1. untagging all contacts tagged with Quick autoreviewed
2. deleting all references to the above from our audit log
3. removing the 7 tags listed above

Ping @MBeat33 & @NNichols

@Eileenmcnaughton I'm good with this plan!