I can't complain, but sometimes I still do
Blair asks a searching question about inaccessible websites over at The Letter - just who do you complain to?
A user's first instinct might be to contact the site owner, but my personal experience is that very few even acknowledge such complaints, let alone act on them. Last year I (anonymously) emailed over a dozen local authority websites which had serious accessibility problems despite claiming AA or AAA conformance, but only one responded (kudos to East Renfrewshire Council who quickly addressed some of the problems and edited their accessibility statement).
Blair's suggestion is a link to the DRC's website inviting users who have found an inaccessible website to report it to the DRC. A fine idea in my opinion, which might pave the way to a dedicated reporting facility should the DRC see the volume of complaints increase.