Found 25th Nov 2016
Not sure this is deliberate but Virgin have a double data offer on some of their low tariffs but I found you can also add it to their other tariffs! you have to hit 'get this plan' then you get offered double data. Singed up to their top whack sim plan at 20gb and am getting 40gb for the price!!! Not bad way to get 4g on EE network without paying through nose!