I understand the intent in helping ISPs to limit collateral damage, and it certainly would be handy to have the problem resolved for the UK editors effected...
But in the midst of the news cycle, and with a bit of a PR backlash in progress, I'm not sure you want to get into "Wikipedia administrators, developers, work with ISPs to block access to images." It can wait a day or two, I think, to see if the IWF or the involved ISPs take action on their own.
Nathan