Pavel Dmitrichenko, the former lead dancer of the Bolshoi Ballet, has been sentenced to six years in prison for his part in an acid attack on the ballet's artistic director.
Co-accused Yuri Zarutsky, who admitted to throwing acid in Filin's face, was sentenced to 10 years in prison, and Andrei Lipatov, who drove Zarutsky to the scene, was sentenced to four years.
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Wintry scenes across the UK this late in April have not been seen since the mid-1980s.
The Labour leader will also announce an inquiry into anti-semitism and other forms of racism to be chaired by Shami Chakrabarti.
A switch in the wind direction will mean the unseasonably bitterly cold air of the last few days finally gives way.