Web pages lost in the post?

Something has been bugging me in the pages of Hansard for a while now. For some reason, whenever they link to websites they either (a) get the html wrong, or (b) they link to dead addresses. For example, today we have a question that asks about scripts for tax credit call centre staff.

Jane Kennedy responded by saying that there are not scripts but the manual and the technical manuals were publicly available here and here respectively. Don't click the links, you get this.

Poor old HMRC huh? They don't seem to be able to find anything these days. Maybe the pages are lost in the post?