"Teachers so I am to believe have half a day a week to prepare lessons, they do in ds school,,,,works very well."
Can I laugh at this point? This theory would work very well IF children were machines - put the prepared lesson in one end, crank the handle, they come out having learned exactly was expected... crank the handle again, next lesson through...
What happens in actual fact is that I plan a week's worth of maths and literacy lessons and then deliver the first. Observation and assessment (informal, continuous, formative assessment - the 'that child has got it, that one needs support, that one has a gap in a previous step that needs revisiting' type) during that lesson means that I then adjust the next lesson's plans to take account of the progress made in the first and any areas of difficulty (or unexpected ability) that may have been uncovered. So I adjust my plans between lesson 1 and 2. Then, of course, by lesson 3 the originally planned lesson is out of kilter with reality.... sometimes we have covered more, sometimes less, sometimes the children will need a different approach or different resources or i will have a useful discussion with a colleague who suggests a new resource or a different approach .. so I replan lesson 3 before I deliver it (and create a new plan for my TA to work with a small group either on an extension task or on a particularly knotty area of difficulty). By then, that nice neat weekly plan is covered in notes and revisions and I replan lessons 4 and 5 (not to mention mark, assess, create resources for etc).
The idea that planning is a once-a-week activity, that can be done for all subjects of the curriculum in a couple of hours one afternoon, is not a picture that I recognise.
I also presume that your son attends a relatively large school. We have 5 teachers in total - we would have 4 but one class has a jobshare. We all run after school clubs because otherwise we could not possibly cover the wide range of opportunities the children deserve. I am not quite certain why I should also run a homework club just because you do not want your son to do homework at home? I am available to be asked about homework before school, after school, at lunchtime, at break time ...