£300 - sod that.
Why not book a tour of the Amex; there's a thread about it from yesterday and for kids it's really cheap. Then take the kids home for a birthday tea, or Pizza Hut or summat? MIght need 2 cars if you had a group of kids but what a great day out! Good party idea, I may just do that for my youngest in February (not the £300 option of course).
Any idea what the thread title was LS? I have tried a search and got nothing.