Maybe the author will have altered perception in the intervening six months :)

I actually stumbled upon your post when looking through various tags to include in a post I'm about to publish about the 'hunt' (not successful this time :).... but a friend who has been more diligent has over 100. This is the very start (at least in Scotland, SE England maybe a bit later?).

Hmmm a diagonal shift right across the country - hope you find your fields, shame the no 'no-trespassing' laws don't apply as they do in Scotland :)