Thank you for your help. Itís been very much appreciated.
I cleared the data folder and have just received my cron email notification and this time, no more warnings.
Iíve also re-checked the data folder and as you say, all the files have been recreated, only this time, under only one owner/group.
There is one thing though. All the recreated files in the Data folder have their permissions set at 644, so as advised earlier, Iíve now changed them to 666.
Will I need to reset these files to 666 each time the cron has run or is it, that once Iíve changed them to 666 I wonít need to change them again?