I don't live in the UK so no skin in this game, but it seems there might be a point here.
Children - 190 days of teaching
Teachers - 195 days of work.
Why can't those extra 5 days be done during the children's holidays? Basically, teachers have to do (say) an extra day's work after the end of each term, or an extra week's work at the end of the school year. If teachers are paid taking into account they have 65 days of holiday, and those holidays must be taken outside term time, then isn't it a total no-brainer to tack these five days onto the end of term? Basically, this is a scheduling thing?
What am I missing?