Thanks Rharv. Yes ......you're right. I changed both drives to the label P: The first drive I changed came back as P: when plugged in again (Great!). Disconnected that one and re-plugged the original PG one and that reported as F: again even though I had also labelled that as P:! Looks like I'll just have to live with it. When updating I'll just have to make sure I direct the update to the right disc label

One thing I did note was that the PG disc was not as full as I originally thought. When looking at the partitions there was a fair amount of unallocated space left which I merged into the main PG disc partition using a partition management program. So I actually had more space than Windows was reporting.
Presently investigating USBDLM V5.2.8 - USB Drive Letter Manager for Windows to see if this will facilitate
renaming both drive labels more permanently.
Kind Regards
Kev T.