I have been looking into this for a while, following the jokers putting out flyers saying ladders are illegal so we now do WFP!
H & S Executive's website mentions ladders are ok is used competently.
I asked our local Trading Standards and they got H and S Execs reposnse of not illegal, if used for more than 30 minutes in one position then needs securing or a cost effective viable alternate needs to be used.
If you are up the ladder for more than 30 minutes without moving it is eother one big window and you are slow or you have fallen asleep.
The key is keeping it safe, there is risk in everything - minimise it!
While we are on it why do so few in our trade use cones and warning signs?#
I have a Traffic Engineering background so use cones and signs where appropriate.
Simon