I renewed our recently. Needed to do it quickly so spoke to the lady at Inverness who deals with it (I think her name is Rosemary). She was happy for me to scan and email the form. I got an email copy by return. All very efficient.
Its worth mentioning that it doesnt cover all HIAL airports. Campbletown and Barra are excluded and possibly a couple others too.
Also its only relevant for HIAL airports so doesnt cover Oban, Coll, Collonsay, Plockton, Broadford etc. Out of these only Oban is a problem out of hours.