We have purged a specific CSS file from our cache.
When we request the file using CURL we can see from the last-modified header that some users are receiving old version of the file dated May 18.
Investigating further we see some users hitting LHR colo are seeing May 18 file, but other users not hitting LHR are receiving correct Sept 30 file.
Note this is always using CURL so does not involve browser caching.
We have tried Purging everything and again purging just the specific file. We have also turned off the Page Rule which caused this file to cached.
Purge does not purge the file from LHR colo.
How do we remove entirely the old version of this file from CloudFlare?