Steve my advice would be to stay as you are so long as its bearable, no harm in putting your CV out there, but a word of warning, our European friends have made sure the salaries are not what we would expect.

I to am from an era where you walked out of a job one day, and into another the next day, and as some have pointed out, age can be an obstacle these days, especially in my case being over 60, the minds willing, but sometimes the body isnt.