We had an FR rasterscan display hooked up to the Watchman installed in the old tower at Farnborough for about 6 months before we moved out, and it displayed the ordinary primary returns rather than electronic ones. The TFT based ATM was also hooked up to the Watchman, prior to being moved to the new tower. Maybe it's only the NATS installed ones which have fully processed Watchman, although I'm aware the Anglia Radar displays which displayed the Cromer Watchman at Stansted were fully processed analogue displays.