You have a point about temporary copies, but it certainly doesn't say anything about implicit permission to read. Temporary copies (albeit with some restrictions) are explicitly excluded from being regarded as infringing copies by s28A of the CDPA anyway, so that whole side of things is rather moot. You could, though, construe the fact that legislators took the trouble to exclude (with those restrictions I mentioned) temporary copies of being indicative of the fact that they, or legal opinion, considered that without that exemption, it could certainly be argued that they would be covered. In fact, if memory serves, there were arguments about exactly that point. There still are arguments about whether operators like Google infringe copyright when they spider, index and worse yet, archive web pages. A US court found that they had not, but a Belgian court found that under EU copyright law, they had. Fun, init?