Yes — Broxbourne says you will need your National Insurance number to join the electoral register or update your address details. You can apply online at GOV.UK through the council’s electoral register service.
| Action | National Insurance number needed? | Where to apply |
|---|---|---|
| Join the electoral register | Yes | GOV.UK |
| Update your address details on the electoral register | Yes | GOV.UK |
| Make other changes, like a name change or reporting someone has left | No | Use the form on the council page |
If you can’t find your National Insurance number, Broxbourne points you to GOV.UK’s “find a lost national insurance number” page.