They charge €3.50 if you spend less than €15 and shipping is only free in Germany. Not sure on the charges to the UK.
If I understand this correctly, shipping to UK is €16, if the order is below €40 and €12 otherwise. €3.50 is only charged if the order is below €15. The link is here.
P.S. I don't understand why Google translate works so bad with this site...