Elettronica Radar Warning Equipment was fitted to Batch 1 Tornadoes. Mainly TTTE ones. They were programmed by putting Diodes into circuit boards, One way or the other to pass or reject a parameter. The only problem was that some diodes were marked correctly, others were not. After a Tornado/Jaguar mid-air collision it was recommended that the RWE be refitted into the TTTE jets to help prevent further incidents. Caused a bit of confusion that did.