A few points to clear up:
@Leon - the GR1 did have the intake ramps connected, but was limited to M1.3 AFAICR. They were wire-locked shut sometime early 90's I think, same with the Kreuger flaps. 920kts is a bit optimistic. I did a tour at TTTE at Cottesmore flying clean GR1's (no pylons either). It was a real sportscar but 900kts - no chance (unless I was an even bigger wimp
). Supercruise? - yes, occasionally. But with double the thrust in reheat, why sit in dry power?
Yr fuel burn figures are slightly pessimistic for the TTTE jets; they were quite slick. Never flew a truly clean GR4, only managed clean but with pylons on test flights so more drag.
@SRENNAPS - the GR1 was fitted with Mk103's for the frontline sqns (TTTE never got 103's) and that is the current engine on GR4's. There have been some modifications but they're basically the same.
HTH.
edit: The GR1 & 4 have 2 radars in the nose: a TFR as you state and a GMR and yes, the GR1 GMR could detect fighters.
