The mother of Lance Corporal Liam Tasker, Jane Duffy, says her son formed an incredibly close bond with Theo, because they were never apart.
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Labour has called for them to resign if they cannot give a full explanation of the whipping operation during crucial Brexit votes.
Gloria Hunniford said she spoke to the singer on Wednesday night.
The Liberal Democrat leader said the threat of a no-deal Brexit has created the conditions for a realignment of politics.