Again, many thanks to Ferrobus for the informed technical advice, and to Lyka who introduced the terrain issue.
In response to the posts encouraging us to use autoland on a cat1 ils, my own feelings are that you would have to use caution for 2 reasons:
Firstly, if the facility is graded as cat1, there is possibly a good reason. For instance, if the terrain close to the threshold is particularly steep (up or down) then the abnormaly fast ramping of the Radalt may affect the trimming of the autopilot(s). Cork, Knock and Leeds spring to mind.
Secondly, your company limitations may specifically prohibit this.
As for a low-level disconnect, on the Fluff at least, against autoland trim, in disorientating viz, I would rather just have another go...