The Comcast guy came as promised and the probem was outside as I have suspected all along.
It took him all of 1o minutes to fix me up and a after a quick modem reboot I am set to surf the web at high speed once again.
I even got a call from customer service today to make sure everything is all good.
(Like I would have let the dude leave my house if it wasn't)
Thankyou for reading my blog, Mr. Comcast surfer!