Well had mine today.
Fortunately I had quite an involved job to walk him round which involved two new DBs fed from source via a swith fuse and SWA, a lot of cable routing and dampness/IP issues.
Spent 20mins talking him through the job and the reasoning behind decisions taken.
This was a warts and all job, some minor things I don't like but not non-compliant.
The assessor made a number of positive remarks and agreed with all my reasonings.
This put us both at ease and the following hour was a quick check through quals, insurance and calibration certs. Then a general chat.
They do like to close the assessments out during the visit, think its a target of theirs, and it does wind them up if you haven't prepared. They send a list of docs to have, have them there for the assessment.
All told, painless.
I didn't ask why cables less than 50mm is C2, sorry.