By the early 70s the RAF could have been:
F-4 for long range AD
Viggen for short range AD and CAS/BAI replacing Lightnings and ordered instead of Harrier and Jaguar
Buccaneer for strike.
With upgrades these could have been relevant well into the 90s.
Think what the Germans did with the F-4, and a Buccaneer Mk3 with essentially Tornado avionics
If Typhoon had not been too delayed we could have missed out a whole generation of Tornado GR1/4/F3 and Harrier GR5/7/9 etc with no drop in capability?