Andrew Wilson was aged just four at the time of the murder in Nairn in the Highlands. He said the only memory he has left of his father is seeing him lying on the ground moments after being shot.

Andrew Wilson was only four years old when he saw his father Alistair lying in a pool of blood after he was shot at their home in Nairn, in the Highlands, on Nov 28 2004. More than 20 years on ...