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Oso Happy Petit looks like it's a miniature rose...doesn't look like it gets big enough to give this effect? Sure is pretty. Maybe it's a Blushing Knockout Rose? http://www.greatgardenplants.com/index.php?pageId=139#thumb
I have a hedge that is made of the single pink knockout roses, and it's fabulous. But a darker pink. Blushing Knockout would give you this effect---blooms all summer, too. I'm in love with my knockout roses.
The picture reminds me of Jackson & Perkins' Simplicity rose, which was often used for hedging. However I've never seen that rose actually look as lush as what their ads depicted. If the blooms are smallish, it might be The Fairy. http://davesgarden.com/guides/pf/go/2863/
It looks like Harlow Carr might also give the same affect. I have the Alnwick rose. It is a very good rose. I'm sorry, I can't find the shot of my entire plant, but here is a close up of the flower. I think I was trying to show someone how it has this kind of glowing white around the edges of the petals on a mature flower. Not a lot of white but it is noticable in the evenings. It sort of looks sparkly in the fading light. You wouldn't catch it in the daylight.
I was going to say that the roses in your photo might not be shrub-type roses. You could get the same affect with a short post and rail type fence and a rambler or climber such as New Dawn maybe, I've seen a photo of a rambler or climber that looks very similar to that photo--so filled in you can't even see the fence. I just can't place it!
I have this rose and it does look very much like the above linked photo. Mine only blooms twice a year (so far) and I'm not thinking that is that same rose. Just an idea if you can't find the exact shrub rose.
Probably not much help, but the lack of thorns in the photo got me to thinking of some rambler or other.
There is a climbing Bonica as well. JasperDale, I'm voting with you and Pinetucky! =D My reserve vote would be for one of the hedging roses J & P used to sell as they used to practically carpet bomb our mailboxes with flyers advertising their simplicity hedge roses. The only quibble I have with Bonica is that the fragrance is minimal for me.