If you can earn/buy some AAdvantage miles, you can fly this route on the Qantas A380 in F for 40,000 miles one way.
Taxes/fees from DXB to LHR are much cheaper because there's no APD. I paid £105.
And of course you get access to the vast Emirates F lounge at DXB if you redeem inbound to London.
http://www.aa.com/i18n/AAdvantage/pu...Miles/main.jsp