Right,
Problem solved!!!
It was the TWRP backups hidden deep in mnt/shell/emulated/TWRP/Backups
Used Rom Toolbox Pro to get at them. Strange thing is i can delete the contents of the backup folders in that above folder but not backup folders themselves (2013-02-06--22-46-37 etc)
Crap thing is everytime i do a nandroid backup, it keeps a copy on there and a copy on the SD card (which i move to PC and then delete). So now everytime i do a nandroid backup i will have to delete from 2 locations.
Problem solved!!!
It was the TWRP backups hidden deep in mnt/shell/emulated/TWRP/Backups
Used Rom Toolbox Pro to get at them. Strange thing is i can delete the contents of the backup folders in that above folder but not backup folders themselves (2013-02-06--22-46-37 etc)
Crap thing is everytime i do a nandroid backup, it keeps a copy on there and a copy on the SD card (which i move to PC and then delete). So now everytime i do a nandroid backup i will have to delete from 2 locations.