Britain's bee population is under threat from the weather and the use of some pesticides, according to campaigners.
British bee farmers say numbers within some colonies have slumped by as much as 50% because of the long winter and last summer's wet weather.
The implications could be felt in homes across the country, not just on the price of honey but because and around a third of what we eat is pollinated.
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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.