If you have knives, better take a Knife sharpener. And if RobinW is taking a jigsaw for her dd I'll take Knex for my ds.
Ever the optimist, I'll take my Keys for house and car in case of a false alarm or they are still in one piece after the crisis.
Lots of big Knickers!! the possible end of the world is definitly a big Knicker occasion.
For L, I'll pack my borrowed Laptop in case the internet - and mumsnet - is still running. Bloss and Chell in sunny Australia, fancy putting up several thousands of your mumsnet frends???
Or I could email an SOS, or find out how to make that gieger counter that RobinW mentioned (Dh was very interested in that when I told him).
My Lenses are an absolute must, and lots of spare pairs, both contacts and glasses because I'm blind without them, vulnerable and useless.
A Lilo - easy to store and makes a good mattress.
Some general Lubrication, like WD40 to help make any emergency contraptions run smoothly.
Life jacket if near water.
And I'll slip in a Lipstick somewhere. Very good value considering how small it is versus how good it can make you feel.