Hi All,
Okay find I wasn't the only one having this problem. It appears Time Machine isn't all it's cracked up to be. So I have gone back to good old Back Up.
Example I ran TM with the console window open and found it got stuck on certain files which caused the error. Once deleted or excluded the TM carried on till it hit another file it didn't like and so on.
This was confirmed by other users having the same problem with TM.
Some reckoned that TM in 10.5.1 was not really backing up everything, which is worrying, and was corrected in the upgrade to 10.5.2, but resulted in the above errors.
Plus others reported external drive problems with continuos use of TM. So I have gone back to .Mac BackUp until it's cured.
Rgds
Gday