I'm not totally clear what you're asking or stating but, AIUI, after 2011:
You will be responsible for the connection from your house to the first (shared) manhole.
The water company will be responsible for everything else on your property which goes in or out of that manhole - including those parts of your neighbours' connections which are under your land *and* for the pipe which goes under your house on its way towards the main sewer.
Is that your interpretation?