Horburns Rose

I have been able to find out very little about this Rose. Im not sure why, but there appears to be very little documentation on Horburns, so if anyone can provide details about it? I love the color of it, but confess I had never seen it before coming across it in the Christchurch Botanical gardens earlier this year.

• Class: Floribunda / Cluster Flowered, Hybrid Tea / Large-Flowered, Shrub.
• Bloom: Blooms in flushes throughout the season.