Just finished Peter Ackroyd's The House of Doctor Dee. He did seem to churn these past/present London occult figure collision novels out for a while (see also Hawksmoor, Chatterton etc.), and this one sometimes just seems like he's writing and rewriting a London historical A to Z. There are some patches are rather wonderful ecstatic writing, but it isn't a successful novel IMHO. I like mine a bit more daring than this, and my favourites in this genre, if you can call it a genre, are Tim Power's The Anubis Gates and Simon Ing's unjustifiably ignored Weight of Numbers (which is a bit like Neil Stephenson's Cryptonomicon but more disturbing and much better written).