UK Foreign Secretary William Hague has criticised Gazprom's decision to cut gas supplies to Ukraine, saying it undermined Russia's reputation as a reliable energy supplier.
"We obviously regret Gazprom's decision to do this and I think such decisions damage the credibility of Russia in supplying energy elsewhere across Europe," Hague said in the parliament.
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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.