Regardless of whether the U.K. is a sweat-of-the-brow country or not, there are certainly countries that are. In Taiwan, Spain, Sweden, Norway, Denmark, Iceland, Finland, etc., Adam probably has a copyright on his restorations whether he wants them or not. In these cases, is it better for him to retain full copyright or apply a CC-BY-SA license? This is the exact same situation I was in with the 2D Walters Museum uploads. Even though I explicitly declared that the images were CC-BY-SA _only_ in sweat-of-the-brow countries, the Commons community went ape-shit over the Walters Museum committing "copyfraud" by not simply applying PD-Art. So basically, the choice for an uploader is either be accused of copyfraud or retain your full copyrights in sweat-of-the-brow countries (which may include the U.K.).