I think it was in 1989 (may be 1990) and most of the following is vague recollection. The navigator was a chap called CJ Weightman, I don't recall the pilot's name. I think the BOI summised that they became disorientated in cloud some time after tanking. The crash site was thought to be somewhere 50nm North of the Islands. Looking back on those times, the Falklands F4 force was very much a place for 'warriors' with fairly relaxed adherance to rules. I'm not saying that these guys broke the rules, I'm just saying that the environment and ethos was far different from today.I'm sure someone else will drop in with more detail.
Sorry I can't help much more. CJ was a gent and someone I shared many beers with.