Dirk Gently fans, and others with an interest in the web of interconnected events, may be interested in the latest Camelford news today:
Camelford water poisoning: Aluminium in brain 'beyond belief' - BBC
http://www.bbc.co.uk/news/uk-england-cornwall-17246490
Is aluminium really a silent killer? - The Telegraph
http://www.telegraph.co.uk/health/9119528/Is-aluminium-really-a-silent-killer.html
...and in the report of a certain Prof Wessely ("The Legend of Camelford"), arguing that the symptoms perceived by the poisoned Camelford residents were influenced by the stress of knowing that they had been poisoned, and by the 'prospect of litigation'...and that therefore there was no point in studying the long-term effects of the poisoning on their health because somebody (him) would just argue that any increased levels of dementia might have been caused by this stress, rather than by the poisoning...
http://forums.phoenixrising.me/showthread.php?8439
There was also some very interesting Alzheimer's research from Germany a year or so ago; unfortunately I can't track down the link but my recollection is that their research suggested that B12 may play a key role in detoxing metals from the nervous system - if this is the case, then depletion of levels of B12 and folates may be the consequence of high levels of metals needing to be detoxed, or, conversely, low levels of B12 and folates may reduce the body's ability to detox metals, leading to neurological symptoms.