Thanks guys, I'd overlooked that, was a late night last night haha. This got rid of some issues.
The rest appear to be files that don't exist, maybe I have done as the poster linked above and copied tombstones instead of files? I don't see where or how but this is life.
Once the bad version in the pool is removed, the other remaining intact one works so just a matter of slogging though them.
Am trying now to cut and paste a batch of folders/files to a new location on another non pooled drive from each pool drive, the bad file then appears to be dumped.
Not sure this makes sense but might help someone if they come across this.
Fingers crossed will now have migrated to 2011 without a file lost, will see in some hours time