My granny, who lived round the corner, had a sort of wild extension to her back garden - originally used during the depression for chickens and the growing of vegetables. There was an Anderson shelter which we used as a den, a huge sycamore which was perfect for climbing and a big stand of blackberries which, of course, we feasted on. We cut sticks and made bows and arrows - luckily not very effective - to play cowboys and Indians. There was a field with a steep slope for sledging in the winter and we had my older cousins' big old sledge which my uncle had made in his workshop. Three could get on it at a pinch!
With all that on our doorstep, not to mention miles of beaches, who really needed toys?