Merseyside Police say two women arrested on suspicion of the manslaughter of pensioner Clifford Clarke, who was killed when he was attacked by a dog in Liverpool, have been released on bail.
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Owners must also prove they have something to pick up dog mess with under new rules imposed by one council.
The former prime minister made the comments as he prepares to return to politics saying he wants to be "part of the debate" on Brexit.
The new measures would mirror childcare vouchers and see workers sacrifice some of their salary to benefit.