Footballer Aaron Ramsey turned reporter to interview his Arsenal teammate Lukas Podolski as they rode around on a bus during their victory parade.
Podolski said it was "amazing" to see the fans who came out to celebrate with them, after the club won 3-2 against Hull City in the FA Cup final.
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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.