You sound to me like you need parenting skills. Allowing your 8 year old son off alone to cycling in the woods and also allowing hime to play in fields behind your cottage sounds very irresponsible to me
I need them too then.
Mine live in the fields and the woods spend most of their time out there,when they are not on the beach, at the moment they are somewhere out there building dens, damming streams, digging holes, and firing off a make shift trebuchet, making livestock do tricks, influencing the wildlife, building jumps for the bikes in the woods, setting traps. burying road kill for the skulls, climbing trees, mining, and generally having a brilliant time.
they appeared a few hours ago, made some lunch, talked me into letting them have some more rope,
and disappeared again, they'll soon reappear when they are hungry or wet, at which point they will get in a bath, eat and go to bed,
It never did me, my siblings, my husband or his siblings, my parents, my husbands's parents, any of my friends any harm.
I tend to parent with an Arthur Ransome influence.
Letting children spend their childhoods sitting in front of screens sounds very irresponsible to me, but each to their own.
I moved to this spot 22 years ago when pregnant with my first precisely so it could have the freedom to have the childhood I did, all of them have loved and gained so much from being free range children, youngest is approximately the same age as the OPs.
When a thing's done, it's done, and if it's not done right, do it differently next time.