Bit off topic but when I had a weeks flying from Stansted last year I stayed with my brother who lives in Shoreditch. His place is a 20 min walk from Liverpool St and I used the Stansted Express (£16 cheap day return) to get to and from work which takes 45 minutes.
The down side is that the last train back to London departs circa midnight (you'd think it would be operating 24/7 these days)and it was the week of all the fog in the South so we were landing back at STN around 1 a.m. but there were coaches to central London (you just had to show your train ticket and no charge) which in fact were quicker door to door due less traffic in the early hours.
However it was a joy to commute without having to fight the traffic and be able to doze off on the journey back without having to worry about drifting off and hitting the central reservation!