Dear Steve,
As far as I am aware the only concern about Aluminium was whether it gave you Alzheimers (in which case stop cooking your food in an Aluminium saucepan).
There was also concern that "acid rain" would release Aluminium into the groundwater - but I think that the reality is that Aluminium is Amphoteric (ie disolved by Alkali) hence once exposed to the "natural world" (which is slightly acid - due to the presence of dissolved Carbon dioxide, and humic acid) it would precipitate out fairly sharpish.
P.S. There are no figures for Aluminium in either the ICRCL or Dutch guidelines
Cheers
Micky Allen