Through our discussions these may be subjects you know very well. Check them out and see what you think. You have made your preference clear on "a goddess" and "The goddess". I get the idea there are heated debates about it where you live. Since I see all of the gods/goddesses as a representation of the divine and divided up into specialties for worship sake. I don't really understand your feelings on this point. I have enjoyed these books and I don't think they will offend :-)
"Spinning the Wheel of Ana" by Kathy Jones
"The Goddess in Glastonbury" by Kathy Jones
Kathy lives on the Isle of Avalon, you should have an easier time finding her books than I have.
"Pagan Cornwall Land of the Goddess" by Cheryl Straffon
Cheryl lives in Cornwall
"The Mist-Filled Path" by Frank Mac Eowen
subtitle Celtic Wisdom for Exiles, Wanderers and Saints
"The Red-Haired Girl From The Bog" by Patricia Monaghan
This next one has nothing to do with Britian but I find it very interesting and enlightening.
"In the Dark Places of Wisdom" by Peter Kingsley
He is a former Fellow of Warburg Institute of London.
Tell me of books that you enjoy and I will look them up!