Ash keys

I was driving north of Gamlingay the other morning, to see a man about a re-spray, and was on the lookout for ash trees, and keen to have a look at them. The die-back disease (Chalara Fraxinea) has been seen in Bedfordshire, as in so many other places, and I wondered if it might be visible.
Happily, although I saw quite a lot of ash trees, I didn't see any evidence of die-back.