Re: Bury it and mark it
Of all the anti-burial arguments, the 10ka signage one has to be the worst. So we could (and possibly have) create a Signage committte, with international experts from Greenpeace, FoE etc. They could meet in exotic locations quarterly, and be funded by taxpayers and the nuclear industry.
Alternatively, repainting signs could just be part of the site maintenance plan. It's a non-problem. Unless the UK gets depopulated entirely, and everyone forgets where the site was, it can be maintained. Or future archaelogists could discover an ancient tomb, and try to discover who may have been buried with such a rich haul of fuel to power their afterlife. Or future us could just change the signage from Waste Dump to Fuel Dump.