Unless you specifically address a flight plan to an en-route unit, they will not be sent your flight plan. This applies both to ATC in CTAs/CTRs and to LARS units in Class G airspace. As far as I'm aware, only London and Scottish Information have a system to 'interrogate' the AFTN to get your FPL.
You file a flight plan so that your destination knows when you are on the way, calculates your eta from the FPL details and can take overdue action if you don't arrive within 30 min of that ETA.