Even my most feverish dreams have nothing on the wayward, experimental substratum of British cinema unfurled in This is Now: Film and Video After Punk, which contains a woozy collection of short films – 30 in all, 20 restored to primal lustre by the BFI – so rich and strange, so unspeakably spooky in that way unique to long-hidden, suddenly unveiled pieces of cinema, that I’d like to howl with depraved joy.