Yeah, depends I think. The daycare/preschools probably have the facilities to change them. The preschool DS goes to is purely a preschool, so he had to be TT.

DS trained at 2yr9mths, and we waited until he was ready, so it was really really quick. He did still have accidents now & then (as they do) and I just told the teachers in the early days that he still needed reminding to go, and I think he's only ever had 2 accidents at preschool. One of the times was when he woke up wet from a nap.. which is when I told them he still needs to be reminded as he wasn't night trained at that stage so still normally wore a nappy to sleep. He was fine after that.