You mention you are atheist, all UK schools are required to have a 'daily act of worship', you can request your child doesn't attend and how schools interpret the law varies.
A lot of state schools are faith schools, you can end up with your child in a faith school if that is where there is a place.
We moved house a couple of times when I was a child, my mum deliberately cut off a lot of her family and I was just too young to be writing letters, I know things are different with the internet but your son could be quite isolated for a while.
I think it is good you are giving it time and if you do move plan for it and maybe move when (if you move) your son is ready to start secondary school, that's 11 in England but I think it might be a year later in Scotland (shout out to Scottish MN), and a few places have middle schools which are start a year younger and then you transfer to high school at about 14.
Another thing about Scotland is that your son would not have to pay for uni.
The advice about doing normal things like shopping and in February is good advice, more hours of dark than light, cold, wet and sometimes snowy.
Good luck with whatever you decide, and if that involves a trip then I'm sure lots of people can give you some ideas.
If you are considering Yorkshire (I'm biased, I was born there) this property reminded me of Australian houses (well a bit) have a look at how they state it has, "Impressive Rear Gardens & Patio" and try not to laugh.
www.rightmove.co.uk/property-for-sale/property-80664809.html