The vehicle will be driven to Mykolaiv, where it will be converted into an ambulance.
With attention on the Middle East, Defence Secretary John Healey said 'Putin wants us to be distracted.'
Tobias Sullivan, Rhys Edwards, Jordan Bailey and Jake Trask plan to drive vet supplies to Kharkiv.
Athletes from Russia and Belarus will be able to compete in senior World Aquatics events under their countries' flags as the body lifts a ban on their participation.
What are the undersea data cables the UK depends on and are the subject of recent spying claims?
Ukrainian President Volodymyr Zelensky says his nation's forces would respond "symmetrically" to Russian attacks.
Easter festivities are muted in Kharkiv as Ukrainians expect fighting to flare up again after a weekend truce.
Vladimir Putin announced the truce, which will last from Saturday afternoon through Easter Sunday.
Mark Stevens says the stoves provide heat and light for people who do not have power in Ukraine.
The government usually refrains from commenting on the participation of its citizens in the conflict.
A former wildlife producer said travelling to a war zone has changed his life.
The ambulance departs for its 1,650-mile (2,655km) journey to Kyiv, Ukraine, on Easter Sunday.