Will a modern child still adore these books? I think so. Some things haven't changed at all since 1961; there is a lot here about wildlife. But then there are the descriptions of farming, (not to mention fox hunting!!!), and how many of us have seen a red squirrel (I nearly did, last year in Northumberland. Missed it, damn) much of the world depicted seeming lifetimes rather than simply decades away. If I had grandchildren I'd definitely buy them these books, and sit down and go through the pages with them.
The format is simple. On the righthand page is a painting by the great traditional countryside artist Tunnicliffe. On the facing page, the text describes what we see, picking out detail and explaining the background. The combination has real charm. We see pigeons eating corn from stooks (surely already anacronistic by 1961?), hop-picking by hand (ditto) and a barn owl surveying old-fashioned haystacks. But much is unchanged, and Tunnicliffe's painting of cattle sheltering from squalling rain behind a hedge is one of his little masterpieces.
When I was a small child, growing up in precisely the countryside found in these pages, I found the books enthralling; but even then, a little old-fashioned. It told me what to see, and often, guided by its gently didactic tone, I saw it. Though beautfully written, the language used in the text is surprisingly grown up; these aren't "early reader" books and grown-ups looking for bedtime reading for an intelligent child will find enough here to stretch them. An ideal introduction to get someone interested in nature, or a blast from the past for sentimental grown-ups.