This puzzle appears under the "Cryptic" heading on the Guardian website, as opposed to the usual Prize.
I'm not sure if this is an error or to reflect the fact that, given there is currently no actual prize, the shape of things to come.
This is a themed puzzle by Maskerade with a jigsaw grid that isn't interactive so I won't be doing it, but good luck to those who do - it looks a real Bank Holiday challenge:-)