Iain Sinclair's classic early text, Lud Heat, explores mysterious cartographic connections between the six Hawksmoor churches in London. In a unique fusion of prose and poetry, Sinclair invokes the mythic realm of King Lud, who according to legend was one of the founders of London, as well as the notion of psychic 'heat' as an enigmatic energy contained in many of its places. The book's many different voices, including the incantatory whispers of Blake and Pound, combine in an amalgamated shamanic sense that somehow works to transcend time.

The transmogrifying intonations and rhythms slowly incorporate new signs, symbols and sigils into the poem that further work on the senses. This was the work that set the 'psychogeographical' tone for much of Sinclair's mature work, as well as inspiring novels like Hawksmoor and Gloriana from his peers Peter Ackroyd and Michael Moorcock, and Alan Moore's From Hell.