Got the SH installed yesterday, now on 100Mb, I set Modem Mode and coupled it up to my D-Link 655 and everything appears to be fine.
VM called with a reminder 2 days before the upgrade, I was down for the 8.00am – 1.00pm slot and the engineer phoned at 9.00am to say he was outside.
New config file was sent to the SH 10 minutes after the engineer left and then it was all systems go at the new speed.
I must say the reminder call gave me confidence that the engineer was actually going to show, not that I have ever experienced a no-show in the past, still it did give an impression of professionalism on the part of VM.