Seem to be quite a few people missing the bit where the Guardian site says "Not necessary for online entries."
That's the easy bit, of course. Now back to solving.
PaulT, thanks for highlighting “Not necessary for online entries”. I’m fairly sure that must be an update as it doesn’t appear in the pdf and I’m sure we would have all spotted it had it been there originally!
For obvious reasons did not post this earlier. By extraordinary coincidence, the theme movie was screened on New Zealand TV the day after the puzzle appeared.