Jayne - you will never get a group of people agreeing on a matter like this.
It is a long time to leave your cat on its own, my two would fight and get bored. A bored can can be a very destructive animal.
But the cat will in all probability be fine - but will you be able to enjoy your break without worrying about him?
Like the others my little boy cat would eat all the food in two seconds (including his sister's food) and then spend the next couple of days starving.
Have a nice break.