The upturn in organ donors proved to be a lifesaver for singing heart patient Vincenzo Avanzato.
He spent 13 weeks on an urgent list awaiting an organ - knowing every day in hospital could be his last - before receiving the greatest Christmas gift of all.
Craig Boden was told he would not survive without a new liver.
But a new organ preserved his life with his partner and two young daughters.
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Among those expected to attend the ceremony will be former US President Bill Clinton and ex-Northern Ireland first minister Peter Robinson.
Five people have been killed and 40 injured after a car and knife attack in London on Wednesday.
A wet, wintry night in places with rain and hill snow slow to move away from southern Scotland and northern England.