Sat Nav - invest in it for the sake of your relationships
I had to make the immense journey to Purley, Surrey the other night - I knew it was going to be traumatic so I borrowed a friends sat nav. A device that previously I thought was wholly unnecessary - well it turns out that if a husband and wife are navigating - the sat nav takes a lot of the emotion out of the business. It does not say "You idiot - why do you never listen to me" merely "do a U turn where legal"