From my dealings with QR they don't offer a free night for flights from the UK...
Yes you can get flights cheaper than the UK but generally the UK is pretty cheap - play around and see what offers you get. I have personally noted that BUD and CPH are cheap to fly from, I am flying for the first time from BUD in May with a LCC from LBA, I noted that MXP and BRU are also very good...
Good looking getting a ticket, BTW i found that J ticket a good price to DXB from LHR..
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I prefer the 777 J ticket on the couple times i have flown J