NFR:
With regards to the Paris computer not having all the aircraft types, surely it's the airline's operations people that sends out the initial flightplan to all the enroute adressees, and that should be the correct information.
When London receives the flight message from the Paris computer to activate the flight in our airspace, the message contains aircraft type. Due to Paris computer not having all the types in that London computer has throws up match discrepancies so we have to confirm the type as we do not have the filed flight plan on sector. The popular ones are A340-600 (Paris tends to send this as a A340-200) and B777-300ER, we differentiate between the long range versions and the normal ones, Paris doesn't. Its an annoyance using up yet more valuable RTF.