This is dynamic shaping.
I have not yet contacted OpenWeb support. I first want to see if my issue would be considered a genuine fault or merely the expected behaviour of the OpenWeb Gold product. A few minutes ago, I started an NNTP download which has not yet managed to exceed 40kB/s download. I understand that shaping is normal, but I consider less than 20% of line speed is a little harsh (I have a Openweb uncapped gold 2Mbps account).
Is this a fault or should I go looking for another ISP?