Many of the families of the victims are meeting to mark the major anniversaries of the Lockerbie bombing, to remember their loved ones and perhaps gain some comfort in their shared loss.
It is remarkable to think it is now 25 years since that terrible night.
It happened as the passengers were on their way to America for Christmas and remains the worst terrorist atrocity in British history.
Tim Backshall has been speaking to one man who lost his daughter that night and who will be giving an address at Westminster Abbey tomorrow evening.
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The 42-year-old was last seen leaving work on Monday lunchtime.
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