Major (Partition) Surgery
Over the past few months I’ve been wanting to put Windows XP back on my main PC for SAS work. Swapping plugs between computers is just too painful! 
Unfortunately when partitioning I created too many primary partitions and now I can’t make any more. Unfortunately Windows won’t install on a extended partition. The solution, as suggested by Malx, was to backup everything with cp -fRa then delete/rearrange partitions before restoring everything back to the new partition!