Thanks again Skelton
Folder Mount won't even install on the internal storage, let alone an SD card, which is rather perplexing.
I suppose I have just got used to my later Android mobile phones having the MOVE TO SD option accessible via the standard APPS menu and only ever had to use apps2sd and link2sd in the past on my first smartphone, the Samsung Galaxy Ace, where I was forced to root it and use those apps to move apps to the SD card in order to desperately create space for just Facebook and Whatsapp!
It's a shame the feature to install downloaded content direct to SD card or move existing apps/games isn't available out of the box. Other than that, I love my GPD