The new MAC laws do also affect those on a LLU line, however, if you are switching to new provider that doesn't accept LLU codes, then it makes no odds to you anyway.
Our broadband connection died on Feb 1st, which was, strangely enough, the day they started migrating us to LLU. I was assured that all would be fine after the upgrade comp ...
We've been with Freeserve/Wanadoo/Orange for about 4 years now, never having changed because we've been more than happy with the service we've had. Up until now.