Almost the entire UK is outraged about the leaks, or at least the authorities and establishment. They are outraged because the US leaked the name and identity of the bomber, as well as the fact he was not a lone wolf or Ukipper, but merely a mule who carried a bomb for a large, indigenous, organized network of radicals embedded in your society, still at work. This disrupts the narrative that would be preferred to comfort the afflicted and the worried within your society. So a reduction in intelligence sharing, at least as a temporary palliative or placebo, will soothe British anger, and yet have little effect on the ongoing efforts of terrorists. There is nothing much more that can be done about them anyway, under the present reality which has taken so long to accrue. It is an unhappy situation all around.