Chased down plenty of EF-111s/F-111s and B-1Bs in the Tornado F3. It was the one area of its performance envelope that it was really second to none - it’s such a shame that nobody ever thought to put one up for the low-level speed record. Even with a weapons load I’ve seen well over 800kts (without incriminating myself!) at low level ‘down south’. I did hear rumour that the HUD KIAS stopped at 999 - in answer to the “how do you know?”, with an answer “because I had to switch Mach”!