Wombat wrote:I have seen an inch thick aluminium plate used, but prefer not to cook with ally as I have enough problems with brain short-circuits

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Nev, this may interest you:
I believe in the '60s a researcher compiled some data that seemed to suggest a possible causal link between aluminium and Alzheimer's disease. He published his findings in a well respected, peer reviewed, scientific journal (I think it was Nature). The information filtered into the world's media, and slipped into the consciousness of people as a simplistic mantra of 'Aluminium causes Alzheimers'.
Meantime, the original researcher reviewed his data, and found that there was an error - he had not, in fact, found any suggestion of a causal link between aluminium and Alzheimer's disease. He published this new finding in the same well respected, peer reviewed scientific journal.
But the damage was done, and most people are now of the opinion that cooking with aluminium saucepans will lead to early dementia. It is a piece of misinformation that still gets regularly consolidated by much of the popular media. When faced with a lack of any other credible evidence, I have even heard people seriously suggest that aluminium must be bad for you because it has the atomic number of 13 (oo-er).
Research is still being done, and it all seems to undermine the case for a causal link.
The idea is so embeded into people's psyche, that even when you explain the situation to people, they still think '...just in case'.
This is not to say that it is necessarily a good idea to consume aluminium; some people react badly to it as an alergy, or a toxin, but in fact we all consume aluminium every day - it exists in water and food, and some things, like tea, cereals, and many herbs and spices have quite high concentrates of it.