Reallocating unused disk space depends on your partition arrangements. Look up the arrangement in Disk Utility. If the recovered space is after your ML partition, delete the unused partition and drag down your ML partition to increase it.
However, if the recovered space is before your ML partition, I don't believe you can reallocate that to the ML partition. I could be wrong of course...
Thanks RV-ABZ, I fixed this now after browsing different threads in the community and thanks once again to all.
Dragging the start-up drive in disc utility to fill the unoccupied space will not work for me as my start-up disk was down the hierarchy (remember my startup disk is the left over from MLPFactor process 'install' and 'Mountain Lion' that were created below the then existing 'OS X Lion running' start-up drive).
What helped? Downloaded the trial version of 'Carbon Copy Cloner', thanks to CCC. In 40 mins I was able to clone the Mountain Lion from down the disk hierarchy into the unused space on top>then booted into the newly cloned Mountain Lion>went into disk utility>removed the old original Mountain Lion down the hierarchy>dragged the corner of the clone to fill all of the unused space>hit 'Apply'.
Thanks once again to all and special thanks to Hackerwayne for helping me refresh my MacBook pro 2.2 that was sleeping on Snow Leopard while I was still looking for a buyer for this machine. I was so much upset with Apple, that I wanted to do a thrashing video for youtube of my MacBook pro which I originally bought for around $2500. But now, I am seeing new hopes and new usage - all thanks go to the amazing people here, now looking eagerly to Maverick & MaverickPFactor. Is Hackerwayne on the job already, he is my super star now.
S