There is a service, at800, that was set up to help with these problems. However, they won't help if you have access to an alternative service on one TV - such as Sky or Virgin Media - even if you have other TVs in the house that can only use Freeview. We've also heard of a number of cases where the filters they've supplied have not been enough to fix the problem and people have ended up having to take time off work to wait in for engineers to visit.
We're trying to gather evidence of the extent of the problem and have created a short survey. If you've been affected, please fill it in here.