When did Europe awaken to Stealth?

Recently i have been arguing that the Eurocanards factored in RCS reduction measures at a relatively late stage in their design (perhaps during the late 80s/early 90s), when the value of American research and designs was apparent.

However, it occurs to me that European powers knew the value of RCS reduction in fighter designs long before that. I am aware of the German “glow worm project”, and I believe the RAF had access to the F117A before it was in the public sphere (?).

So when did the various European countries start to actively think about Stealth?