The FDOR (Flight Data Operations Room) was manned by 2 or 3 assistants, if my memory serves me well, each with a telephone to take ALL the estimates inbound to LATCC. Each phone had a dedicated set of destinations eg Maastrict, Amsterdam, Copenhagen etc and links to the corresponding sectors eg Clacton , North Sea. It doesn't take much to realise what it was like around midday with all the outbound EHAM traffic all reqesting co-ordinated climb etc. It was a shambles and lasted only a few months, when the lines were then re-directed to the sectors and we had the system that lasted until NERC, ie estimates received on the sectors themselves.