ByTheWay - tbh, it really has little impact on me, as a TA, in the classroom, nor on the teacher because we do not recover missed work as such. We do make sure the children are up to scratch with key things obviously, but in my experience, a week or two doesn't make most children fall behind enough to warrant additional support in class beyond a quick 5 or 10 minute recap at most. And the way the curriculum works no key elements of the curriculum are covered as just a one of. They are all recapped on at various times over the year and then again in subsequent years.
I work in a school where we have many children with families overseas and many take term time holidays, especially linked to visiting family. It is only when children are off for extended times - such as 3 or 4 weeks or more - or several times each year that we notice an issue. And tbh that affects any child who misses a lot of school be it for holidays or illness, etc. But this is very unusual, so it is one or two children in the year group or school, not several per class.
That is my experience anyway.
Obviously once in upper years of Y9/10 and onwards it is very different.