Hi Paul.
Know how you feel, I was in the same boat as being with the same company for a long time, but 4 years ago, being pissed of, walked out of the job I had done for 9 years, as a production manager, to my suprise I cleaned of my tools and really enjoyed working back on the bench for 2 years, and was suprised at the comments & praises I received from my employers, what I'm trying to say is don't be affraid of moving on, you could be plesantly suprised.
I was tempted back to my original employer, and am production manager again "WHAT A MUG".
At present we are just waiting for a case officer & plan to do a reccie before we decide what to do.
Keep in touch