Unfortunately this is what happens when you have a cat. It's called responsibility.

We urge all pet owners to look at all the costs involved BEFORE you get a pet. Hundreds of people leave their pets in boarding kennels & catteries every summer so the costs are obviously not that bad.

Do you not have any friends that will cat-sit for you over the summer? Have you posted adverts looking for someone to have your cat and in return you will have theirs when they go away?