Interesting, thanks for that! I was just querying, as when I saw them at Reading 2013, when they were still relatively unknown, they packed out the NME tent, people were collapsing and being crushed at the front, would have thought it would be manic to put them in there again. We shall see
Just been on their website, its saying 25th @ Leeds and 26th @ Reading, so the Friday and Saturday.
And checked on Muse, which is Reading on 25th and Leeds 26th. I don't know if these dates are definite though or just on a default basis...