How about the Spey Skyhawk?
Same basic engine as the F-4K. Was offered to Belgium, Netherlands and Italy in the late 60s (1966-68 timeframe). The main advantage of the Skyhawk was that it was a very efficient little airframe (low structural weight), delivering good payload-range. Otherwise A-7 Corsair would be an obvious choice for a bomb truck, though apparently the avionics were too complex for a basic tactical jet.
More info on the Spey Skyhawk here:
www.secretprojects.co.uk/forum/index.php/topic,2144.0.html
https://books.google.com/books?id=ubDgAwAAQBAJ&lpg=PA79&ots=zB5LHUAn1e&dq=spey a-4 skyhawk&pg=PA78#v=onepage&q&f=false
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The Jaguar itself was way overrated. I've taken a good look at the Jag's performance figures (available on Avialogs.com), and they stink. The design was compromised from the get go due to the supersonic requirement, which led to a terrible wing-design (wing was too small, low-lift, too thin for combat slats) and gas-guzzling afterburners. This was compounded by the Adour engines' anemic performance in dry thrust... a problem that the RAF only fixed after 2 re-enginings (Adour Mk 104 and Mk 106). Most of the time however, in dry power the Jaguar would be a sitting duck - it could only fly slow, straight and low. The higher it flew, or the hotter the temperature, the worse it would compare to other jets (due to the Adour's high bypass ratio). The only solution was to engage the afterburners (which pilots would have to do all the time... in order to climb, turn, or accelerate) but then the Jag's nice paper combat range became distinctly average.
In fact, looking at the Jag's performance figures, it now makes sense why the French Navy dropped the Jaguar M and ran away from it as fast as it could. Even the much-maligned Super Etendard turned out to be a better alternative, with superior carrier performance, longer range at altitude, much better maneuverability (excellent thrust/weight in dry thrust), similar payload etc. The best thing that could be said for the Jag M was that at low altitude and in favorable circumstances it might have a 20% higher combat radius... but only if the pilot flew straight and kept his hands away from those afterburners!
So to sum-up, for low-level attack, the Spey Skyhawk or A-7 Corsair would be best. For good all-round performance at all altitudes (including as a tactical day fighter over West Germany), Super Etendard. And let's not forget the Mirage F1, the Jag's closest competitor, which cost about the same and was much more versatile. The export markets made no mistake in preferring it to the Jag... but probably not an option for the RAF!