Try Geoffrey Ashe - Mythology of the British Isle
Lucan- roman poet; "You, ye druids,.. you who dwell in deep woods in sequestered woods; your teaching is that the shades of the dead do not make their way to the silent abode of Erebus or the lightless realm of Dis below, but that the same soul animates the limbs in another sphere. If you sing of certainties, death is the centre of continuous life. Truly the peoples on whom the Pole star shines are happy in their error, for they are not harassed by the greatest of terrors, the fear of death"... 1st century ad. the book just magically opened on that. And surely, all those that did thesises, or whatever, remember that Tess slept on the altar stone at Stonehenge guarded by her lover before the local constables arrived early in the dawn light to take her to prison.
Moss