The cull was delayed after farmers said they may not be able to kill enough of the wild animals to make the scheme effective.
It had also emerged there were more badgers in the cull areas in Somerset and Gloucestershire than previously estimated, meaning that more would have to be killed to meet the 70% target needed for the programme to be effective.
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PM spokesman's comments come following reports that the EU is secretly drawing up plans for greater military cooperation across the EU.
The Labour politicians put their alleged differences aside to jointly highlight how remaining in the EU could help fight climate change.
Late sunshine here and there this evening - but more cloud for southern Scotland, northern England and Northern Ireland again.