Denby already have a sale on. Today is their "Final Day of our EXTRA 15% off Christmas Countdown" with two new codes - that give an extra 15% off AND a free carving set with orders over £50. I also found (too late for my own order, unfortunately) that you can add ANOTHER code on the order summary page, DENBCHAT130513 for an extra 5% off the lot. I haven't tried the last code - it might be a one-off code, but it's worth a try.
GIFT15 - extra 15% off
FREEGIFT - free carving set (add the carving set into your basket before you checkout)
DENBCHAT130513 - extra 5% off (but see below)
Edit - NB. From other posters, it seems the 5% code might be an individually generated code. I got it up on my screen after I put stuff in my basket and then closed the window (ie as if I was about to leave the site without purchasing). A teapot-shaped window then popped up with the extra code. If you haven't ordered yet, you might like to try doing the same, if you can deal with the hassle for an extra 5% off.