The on-line process doesn't give you an option to submit the form.
I received an e-mail from the administration staff to acknowledge my application and which invited me to return the form that had been attached to the e-mail 'to prevent delays in processing my application.' I thanked her for the e-mail and highlighted that by their own admission on their website, submission of the form was not a mandatory requirement, to which her reply was: 'Whilst it is not mandatory to complete the form, we are required to complete vetting on the occupants of the address. When the form is not completed the firearms enquiry officer will request this information at your home visit.' I thanked her for confirming and highlighted that we looked forward to the officer's visit. I didn't hear anything further about it, since in the event, the FEO wasn't able to attend my home due to traffic delays and he processed my renewal over the phone whilst he was driving. I received my co-terminus certs about a week later.
Quite how taking the names of two people during the home visit can delay the application process is beyond me. It's another example of mission creep on their behalf and an infringement of freedoms. I've held a certificate since I was about 15, I'm now 57. I must be one of the lowest risks on their books.
T