I am not sure what would happen if Jersey immigration wanted to confirm your ID and you had nothing photographic. I suspect it would be no different than if the domestic photo machine breaks and you have no photo ID - a lot of tutting from Border agents but they let you through in the end.

The Jersey website refers to what sort of photo ID ferry companies or airlines will accept, indicating that they have no preference.

Most seem uninterested - I have certainly never been asked for photo ID when travelling on ferries from Jersey to Guernsey/UK.

My point, however, is BA do not require photo ID on these flights or domestic flights, despite the insistence of both check in staff and superviser at LGW that BA "always require photo ID for all flights including domestics".