Britain Christ and the Dharmasutra, Volume I - Illuminating the Dark Ages

Undated but from appearances, circa 1985.  102pp stapled large format booklet in light card covers, with occasional monochrome illustrations in text. There are initials inked on the first leaf which may, or may not, be those of the author.  4to.  A little shelf wear to covers, which are very gently rubbed at edges in places.  Internally the pages are a little toned else neat, clean and tight. The author states in his introduction that "this is a study of the reality underlying the British Dark Ages.  The story of a lost religion, British Tantric Christianity. A mystic Christianity utilising concepts and symbols remarkably similar to Tibetan Buddhism".   Very hard to find title.