2 settling in sessions, one June (parents given info pack and have a PTA coffee session and uniform sale during it if they want to), one July with a presentation for the parents. reception started first day of term, half days, home visits in the afternoon after all children had done 4 half days at the school in the previous week so they know who the teacher and TA are.
Home visits have happened for many many years, I remember my mum mentioning them and she retired a long time ago. Some schools do them, some don't. I don't mind it, for an anxious child it gives them the opportunity to see the teacher and TA on a one to one basis in their own environment, my daughter liked showing the teacher some of her things and doing some exercises with them as part of the starting school book. We will have another one this year for my other child. I think the home visits CAN serve another very important purpose in that there MAY be things which come to light there which can indicate support issues, the staff can find out details like whether there are 2 adults there or a single parent household or an extended family or only child or 17 siblings etc. It gives them an insight into what the child's experiences may have been. I don't believe they are there to judge people or their homes I really don't. for my daughter it meant they found out things like she liked being out in the garden, picking flowers etc, has a sibling, a stay at home mum, likes books. things that may not come to be obvious at school for quite some time. It doesn't mean they would view a child in different circumstances any differently but it does give them more of a way to get to know the child.
Ours were optional, I think virtually everyone accepted. as the children were on half days for the first 3 weeks anyway people were having to take time off work or arrange grandparents etc to cover so it didn't seem to be a problem to people. it is only about 15 minutes but equally if you said no then I can't see it would be a problem. They may however ask to meet you in the school briefly just to check there wasn't anything they should know about your child's personality (mine has a phobia for example which I hadn't had the opportunity to raise or tell them how we were tackling it)