The plane bringing home Corporal William Savage, Fusilier Samuel Flint and Private Robert Hetherington has just landed at RAF Brize Norton.
Close family will spend time with the coffins before the cortege passes through the village of Carterton where friends and family will pay their respects as a memorial bell tolls.
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First Minister Nicola Sturgeon was among those who paid tributes to the former Dundee East MP, saying his loss would be "keenly felt".
Former Conservative party chairman says the mistakes of two Tory Prime Ministers in row have had "calamitous" consequences for Britain.
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