You can currently get 2 for 1 meals at Pizza Express up until 29th January 2009. All you need to do is to visit the offer website here to download your discount voucher. Then present it to your waiter when you order your meal.
There is a great credit crunch busting deal currently for Pizza Express. With the below voucher below you are able to get 1 pizza free for every pizza you order. The cheapest of the 2 pizzas will be free but obviously you can buy the expensive pizzas to get a great deal. They require you to fill in your name and address at which point you can print out the voucher. The good thing about this deal is that its valid Monday to Sunday. There are no restrictions.
Valid until 7th December 2008.