Thanks everyone. As it happened I went back out to the car shortly after I'd posted my question and pulled a bit harder - job done.
Only problem is that you can't be totally sure that it's fully and correctly refitted as there's no latch or anything like a positive click to reassure you that the air filter box is completely sealed. I had a good look underneath with the aid of a mirror and it looks pretty even all round, so I guess that's as good as it gets.
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