It is interesting to note that BP
has it's world headquarters only a few blocks from the Houses of Palrament.
What happened here was a terrible mix of issues.
You had one of the worst terror acts involving aircraft happen. As with such acts, it is almost impossible to really determine who did them or were behind them. Evidence was destroyed, there was much less of a paper or electornic trail to trace to criminal evidence stanadards in 1988 than now to help and people involved were able to hide their identies more easily.
Lybia was a believable supporter of this act of terror due to the attempts under then Pres. Reagan of the USA to murder Qudaffi for his support of terror against Israel with a bombing of his housing compound, killing at least one of his daughters and injuring others.
There was not enough security for international air flights at that time and indeed PA 103 did force a step up in the standards world wide and with flights involving the USA (such as baggage-pax matching).
You had citizens of the USA and families of the vicitms of PA 103 that wanted any kind of revenge against those that did it. Lybia faced substantual economic and trade sanctions from the USA and Europe including on oil sales, just making the situation worse.
Eventually the need for oil by the world and Lybia's need for income caused deals to be made that paid off the vicitms families but never gain real justice.
The justice process was was terrible mix that was intended, especially for Lybia, to be not worth the effort, comprimised UK/Scottish laws, had questions of evidence and political pressures from the USA resulting in a show trial with only 1 person convicted.
That no real justice was done and indeed that the appeal pending could have overthrown the convictons requiered saving face as well as end the sactions as they were of no real value. Lybia was able to show that they could beat the USA and Europe in politics, to the benefit of Qudaffi and make him look like the hero he wanted to be to the Islamic world.
In the end, we never were able to resolve this matter for anyone's satisfaction. Perhaps it is better to just move on.