The shadow environment secretary Mary Creagh has accused the Government of another "U-turn" over the badger cull postponement.
She said the Environment Secretary Owen Paterson had been "yanked back" from a trip to promote British produce in France by the Prime Minister "who told him it was game over" for the cull.
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It is the first such incident between the two countries.
The Met Office said there is around a 30% chance the all-time weather record of 38.5C could be broken.
Producers said they had stopped production and were focusing on the incident.