So, I took the plunge and decided to cut three inches off my hair yesterday. :o
I don't regret it as it desperately needed the trim.  I'm pleased to say that most of the bleach is out of my hair now - probably only an inch to two inches left!  
Still, it did make me feel a little blue as my hair is now back to just below shoulder length.  I've always known that this is a long journey that I'm on, and one that will have its ups and downs, but still, it is frustrating when you realise that you just have to take that step, and cut off the damage!  I will try and get some pictures posted for you to see.
The journey continues...

Congrats on taking that big step.  Yes, you've lost significant length, but now you have ends that are much healthier and will look good for a long time while you continue to grow your hair.  Hang in there - it is worth it.

Congrats on losing most of the damage, JL. I know that your hair will thank you in the coming months.  :)

Thanks Angel Spun and BB!!  ;)
I know I've just gotta keep hangin' in there!
After much thought, I've also coloured my hair - not permanently mind!!  Just a no-ammonia light brown colour in order to even out the colour (from the remaining yucky bleach).  I am monitoring it closely now and if it starts to look the slightest bit dry/damaged, then I'll have to have a re-think!