This just stolen from the Ground Zero Games webstore:
"Our SUMMER SALE is now on! The SALE will
run until Midnight (UK time) on MONDAY 9th of July, so you have just
over 11 days to get your orders in. For the duration of the sale, ALL ITEMS ON
THE STORE ARE AT 15% OFF NORMAL LIST PRICES."
Thanks to Chief Lackey Rich for spotting this and posting about it on TMP.