I used to wonder about the hitman theory,but definately would have thought that Jeremy would have had a good alibi.I will probably get slated for this,but I have never been totally convinced by Macdonalds or Collins alibis.With regard to Macdonald - his alibi was that he spent the night with a girlfriend.I know that I have got out of bed on many occasions,maybe drove myself to Tesco for some goodies,got back into bed a couple of hours later only to find hubby snoring away totally oblivious.He would innocently swear to anyone that Id been in bed all night.Collins disappeared just before the murders and returned just after.His alibi was a passport stamp to (I think)Greece?If anyone remembers,back in the 80's,you could actually buy a driving license if you knew the right people,so Im sure a passport stamp could just as easily have been aquired.And after the murders,he seemingly disapperared without trace!