The family of John Walmsley, who died following a collision on the M25 on Tuesday has released the following tribute: "John Walmsley, our dad, was a great dad, grandad and most importantly great husband, who is irreplaceable.
"He had the affection and respect of just about everyone he come in contact with, due to his honesty and kindness with/to them. He will be greatly missed by his family and all who knew him."
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Captain Mike Green, a senior flying instructor, was piloting the two seater helicopter involved in the crash.