Thanks John, not quite what I was looking for, found another program, AttributeMagic this seems to work great although I think their column headings/definitions are wrong but you can work it out. Still it only does 20 items at a time and costs $25 to buy, not being tight but this software was last updated in 2005 so am not going to pay for it.
Leo, that would be great if you could;
If possible could you get it to copy the Shooting time to both the Modified and Created date/time overwriting them completely. You may want to put something in there that if there is no Shooting time then not to make changes as I have found several files without this date populated. Without sounding cheeky and ungrateful, could you get it to run on subfolders also.
Thanks,
Mark.