That was in October. The box was there on my form too, but for some reason that only applies if you live in Northern Ireland, I don't know why. The booklet ' How to import a vehicle into the UK' says the same thing.
I did wonder if they would send the form back, but although they did, because they didn't see the NOVA number I provided, insurance wasn't mentioned.
That said, as it's a 1971 bike I get free road tax, if you are paying to tax it maybe you need to provide insurance details for that.