Remove Step Three Postage & Packaging from checkout


I was wondering if its possible to remove Step 3 (Postage & Packaging) from the one page checkout. Our client is saying there are two many steps and as she only has one delivery cost stage 3 is not needed.

I thought changing “If all the customer data is filled in, then show the following step at one-page checkout” to Payment Method would have done it but it doesn’t seem to do anything.

Thanks in advance