Just to provide an update on this, Virgin refused to upgrade us over the phone to 100mbit insisting the VMNG300 modem was not capable of 100mbit. So i thought fine ill just bring it up with the engineer when he arrives.
A couple of days later i then got a call saying we could get 100mbit internet and keep the phone line (which has had no phone connected since the NTL dialup days) for
£30 a month which i thought was a bit strange as we had already agreed to get rid of the phone we never used and just have 100mbit broadband for £34.75 a month. But hey we were currently paying £37.50 for 20mbit and a phone line we never used, so i'm not going to knock getting more for less. I then brought up the issue of keeping the VMNG300, the girl said that was fine and a few people had done that. (A contraindication to the last person i spoke to)
So anyway fast foward to today, the engineer arrived carrying a superhub as expected (why else would someone need to come out to get us on 100mbit?). I told him I had been told it was possible to keep the VMNG300 and that it would do 100mbit. He insisted it wouldnt be capable and phone'd his boss, his boss said the VMNG300 should have no problems and just to try it for us.
He proceeded to log on to some Virgin speed test branded website, then check the configuration of our modem, when he was satisfied we were getting 20mbit he made another call and got a guy to send the 100mbit config to our modem.
After he ran some Virgin branded version of speedtest.net again and we got 95mbit, he was like well i didnt expect that, thats the first time i have ever seen this modem do more than 50mbit. He was very surprised i was correct about that. (probably thought i was wasting his time saying that before, however he was always nice about it).
He made a note of the speed and went on his way.
I had to shoot off to work after that, however have just logged on to my home server and done some quick tests, definitely getting the full 100mbit download and 5mbit upload.
Download:
Upload:
Overall i'm happy i got to keep our modem, I just dont understand why each person at Virgin says something different? pretty clear they dont communicate with each other. I'm sure Virgin could have sent the 100mbit config out when i first phoned up weeks ago, then if i didn't work fair enough send an engineer out with a superhub.