Ok found the problem after some further googling:-) (Isn't it always the case, been looking all day and after I ask I find the answer!)
The devices are reset in /etc/udev/rules.d/70-persistent-net.rules Changing this allows what I want. K -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/