Johnny 37,
With lack of awareness of Hypos, you run the risk of having too much insulin in your system, causing your BG to fall to the extent that you lose conciousness and cause injury to yourself and others, OR WORSE. The speed of the loss of conciousness can be pretty rapid.
I was advised that if you start to lose awareness of hypos, running your BGs a bit higher for a period can help to regain hypo awareness.
I have also heard that the older insulins can be better than the modern GM created insulins in regaining hypo awareness.
I don't want to harp on but if you drive, try to get this sorted out before DVLA catch you out because nipping this in the bud can be quicker and less of a "ball-ache" than trying to get back a lost licence, aside from the guilt if something goes wrong.