considering the number of boats going I wasn't even going to bother the coast guard - I only ever file passage plans for solo trips.
but that's me - you should do whatever you feel comfortable with.
if someone really is concerned about all of us becoming in need of assistance simultaneously then I suggest you gather all the info up and report the trip only once. its a pain when going to the scillies as you will be out of radio range of the coastguard when you get there so will have to telephone your safe arrival notification through.
if someone really is that paranoid I suggest you volunteer for the task as I can't be arsed...
just bear in mind as a group weve got more rescue power than the coast guard could get out to us anyway