Here’s Mark Todd, Labour MP for South Derbyshire, explaining why you should have your Internet connection cut off without even a written notice:
Is my hon. Friend sure that a postal delivery will suffice? Many people may have chosen to form a contract with an ISP at some stage before moving, and may not have seen any particular reason to notify the ISP of a change of address.Yes, the last time I moved, I simply had the movers run a private fiber loop from my old premises to the new place. It took most of the day and they had to dig up nearly all of central London, but it was lots easier, ultimately, than notifying my ISP of my change of address.
Source: carocat