Cycling around Blackwall roundabout E14

Hi there, Relatively new cyclist, been riding in country lanes for last few months as part of my commute and adding miles to my tri training. Until last week when I realised how pathetic it is to get the Jubilee Line from Stratford to Canary Wharf, when it's only 3.5miles.... That is, until I get to Blackwall roundabout on my way back to Stratford. How the hell do I get around it without a) getting knocked off my bike by cars wanting to go up onto Aspen Way and b) walking, rather embarrasingly, across the roundabout pushing my bike. There must be a way? Right?!