Sorry to hear your very sad news Graham. Having recently lost my Dad I have an idea of how you are feeling. I know with me it was the feeling of such loss, not knowing how to deal with it, and realising, oddly, how death is so final. What I wouldn't give to see my Dad again. There are so many emotions grief brings. All I can advise is be kind to yourself, grieve, cry, and remember the good times you had with your friend, and how lucky you were to have each other.