This bug on http://www.amazon.co.uk
Amazon.co.uk allows you purchase something with free Super Saver delivery and get it delivered within the time frame of first class delivery.
Firstly, you place the order with Super Saver delivery and after the order has been placed, you then go onto the status of your order and change the delivery option to First Class. This should change your dispatch date and delivery date to about 5 days earlier than it was with Super Saver delivery. You then change the delivery option back to Super Saver and guess what the estimated dispatch and delivery dates stay the same and you still get the postage free.
This has worked for me a number of times and the latest one was a week ago when I purchased the ipod intempo speakers found through HUKD. I orignially ordered the speakers on the 1st March and the dispatch estimate was 5-6th of March and delivery estimate the 10th of March. I then did the process described above and the dispatch estimate changed to the 2nd of March and the delviery to the 4th and stayed that way when I changed the postage back to Super Saver. I then received the speakers on the 3rd of March, two days after ordering, when the original estimate was 8 days. Hopefully others can try this and verify that it always works.