or do they know something nobody else does?
We took a southern route out of Heathrow yesterday - over Lands End and turned north around 40W for the rest of the crossing. At the time, the "black & red" areas were in the area you mention and in the area we were flying but no ash was indicated above FL200.
That changed late yesterday as we see.
June 18th is a very long time away - relax and closer to departure keep in touch with the airline and, for exactly the reason behind the question you ask, ignore the ash charts, it'll bring better peace-of-mind, ;-) . PJ2