Monobloc mixer leaking from head

Just installed a new monobloc mixer, and it leaks from the head.
http://www.screwfix.com/app/sfd/cat/pro.jsp?ts ˜397&id769
I can't figure out how to get the head off. There's a little clip on circular thing on the front, which I pried off. Inside I found a small screw that I undid with an allen key. That didn't seem to release anything. Should I just use more force?
Ben
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Send it back for a replacement before you damage it. It's obviously a Friday afternoon model.
Christian.
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Done - Screwfix will deliver a new one tomorrow and pick up the old one next Monday to give me time to swap them over. I think that's a + for screwfix.
Ben
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