I work in Westminster and used to cycle most days using this route (from the Bellenden area). It's almost all on quiet roads and it takes the cycle bypass round E&C. It has one hill but you can skip it if you want by going all the way along Lyndhurst Way at the start. My fastest time was around 25 mins but it often took over 30 - depends a lot on traffic lights. http://g.co/maps/rderp When not cycling I get the train from Peckham Rye to Victoria and walk the rest of the way. Living in the Bellenden area makes the commute very manageable. Other options if you live further into ED - bus up LL to Denmark Hill and train to Victoria - or ED/Denmark Hill to London Bridge then Jubilee Line to Westminster.