Apologies for those trying to get to NICE documents via TRIP - the majority don't work.
Fortunately (!!), this isn't our fault. NICE have moved over to a new CMS and as such the bulk of the old URLs are defunct. Initially, the changes were introduced with no re-direct. However, they appear to have introduced a minor fix - which doesn't work on TRIP.
Bottom line: I've re-indexed the guidelines and technology appraisals and they should be 'searchable' over the weekend.