Well you would immediatley stop all outbounds getting airborne, phone all of the adjacent sectors ie french, manchester etc etc, and ensure that they dont handover anymore traffic(hold them, divert them). Then you are left with the traffic you have when the radars went. You then control these planes procedurally, using the paper strips. They will all be level seperated, and you would then negotiate with adjacent sectors who have radar, how you are going to present these planes to them. But yes we would use the paper strips and control procedurally.