I must confess that I'm not a techie or high-tech addict. But another thing I need to confess that I do really love the idea of knowledge sharing and iTunes University does a fantastic job.
This 'Audio walking tour of East London' produced by the Queen Mary, University of London in 2012. There are 12 short audio clips introduce 12 stops starts at Liverpool Street to Lusby's Music Hall. The journey can be finished around an hour but of course it depends on your own preferences.