First, glyphosate CAN affect shrubs. It can affect (almost) anything it gets sprayed upon. English ivy is one of the exceptions.
Having said that, I have never seen a plant get "chlorotic" from glyphosate, rather, leaves paling or fading out and going brown. But no "chlorotic" symptoms - meaning yellowing of the leaf with greener cells around the veins.
Your weigela sounds more like real glyphosate damage.
It makes sense if the wind perhaps blew drift over the wall on the lilac, but are we talking about "chlorosis" in the same way?

I'll get pics up tomorrow. Maybe I'm fuzzy on the word, but the leaves are surely not the right colour.

I am so very technologically challenged, but after swearing at my phone for an hour, here is hopefully a picture.

Here is a link that might be useful: Leaves onmy lilac

Another pic, this is the hypericum next to the weigela.

Here is a link that might be useful: Hypericum hidcote leaves

Sorry to send these out all in separate posts but I'm just glad I worked out how to send them at all!

Here is one of my rugosa roses on the other corner. The leaves are pale and thin, weirdly shaped, and the buds are failing.

Here is a link that might be useful: Rogosa roses

They have been hit with a herbicide, that's for sure. I'd have them out for another look.
As mentioned above, glyphosate will harm shrubs if they are sprayed. If he said otherwise, he's not qualified to spray or respond to complaints.
Mike

And for what it's worth, here is my poor defoliating weigela.

So, do you think they're doomed? Or do you think they're likely to recover? This is a matter of 4 shrubs plus the rugosa thicket, so another who knows how many there. So it's potentially a very big loss to my hedge. And the lilac has sentimental value.

Here is a link that might be useful: Weigela

You can kill ivy with Roundup, you just need to add a really powerful surfactant like Induce.

"As mentioned above, glyphosate will harm shrubs if they are sprayed. If he said otherwise, he's not qualified to spray or respond to complaints."

Agree with Mike. Next time record the conversation with your smartphone and report it to your local consumer advocate.

Generally, herbicide drift on shrubs or other woody plants does not cause permanent damage. It can most certainly stunt or distort foliage or cause it to dry and fall off and it can also abort flowering if buds are present. But the amount of drift is seldom ever sufficient to be translocated into the root system on trees and shrubs and cause systemic damage.

Although they may not look very attractive for awhile and not bloom as expected. most trees and shrubs exposed to herbicide drift recover just fine.

If your Environmental person doubts the responses you have received so far, just have him Google "herbicidal drift on shrubs" and view all those hundreds of images documenting this fact :-))

Talk to the council and show them your pictures. If they have an arboricultural officer they would be worth talking to also.

BTW the 'lilac' is not a lilac but something else.

Thanks gardengal, that's so much what I was hoping to hear!

Floral_uk, why on earth are you disputing that it's a lilac?

Because it doesn't look like one and I thought you'd like to know. The leaves are entirely different. (And I don't mean the discoloured ones) When you talk to the Council having the correct info and sounding as if you know about plants will carry weight. If you could show some pictures of more of the normal foliage I'll look again. Or possibly something's gone wrong with your photo posting and it's showing the wrong picture. The same picture appears for the Hypericum link. The Weigela and The Rosa rugosa are what they say they are.

Newske, I think your technologically challenged problem got in the way. The pics you posted of the lilac and the Hypericum hidcote are the same pic. just saying...

Maybe a Canadian lilac, Syringa x prestoniae?

Possibly Syringa x prestoniae but that would be quite unusual here. Only a few specialist nurseries carry it. Another view of healthy leaves would settle it.