I've recently seen the Italeri 1/72nd scale kit, and another one, can't remember who's, as i don't normally look at 1/72nd scale. far as i know, the Airfix kit has not been re-tooled, so will likely be the original kit from the late 1960's, in which case it's not an F5E, but an early F5 'Freedom Fighter'.
In 1/48th the Italeri kit is still around, which I think is ex-Esci (more than likely, a thats what became Italeri) and it's a nice kit. Apart from the new AFV Club kit, I've also seen another, I think from Academy, in 1/48th scale.
I'll have a look aroun d over here and let you know if I find anything.