Free Delivery on all orders over £30 at Dorothy Perkins Wed 19th - Tues 25th March.
You don't need a code for free delivery, it's applied automatically so you should be able to use one of the attached discount codes as well.
Normally Dotty P's only let you apply one code at checkout so you usually have to work out whether it gives you the best deal by using a discount code or a free delivery code. This way you automatically get free delivery plus you'll be able to use a discount code as well. Bonus!!