Have since been in contact with a BT support supervisor after much wrangling with the first line support. Finally after much re iteration of the status and tests I had repeatedly done and tested I was informed that it was an update error that may be fixed in the future. However I was told that by implementing my own router I would be able to access the ports needed. Having now purchased a Draytek 2860n and set it up on a different broadband connection with the same equipment and tested it I moved it onto my BT Infinity, changed the connection and gateway to match and, yes you are there before me, the ports are no longer available. Not only are BT either blocking or 'throttling' the service ports they are too ashamed or ignorant to come clean.