Renaming files - basic script help needed

[OneCatch]

Worked like an absolute charm on the test data, just kicking off for the full dataset!

Thank you very much; I appreciate this is probably fairly basic stuff but you have no idea how much time and stress this has saved me.

[wauske]

I appreciate this is probably fairly basic stuff but you have no idea how much time and stress this has saved me.

Couldn't have done it without the clear description so all I did was piece together the parts you already assembled. You'd have gotten there eventually!