TFL do a cycling route finder, it's brilliant to watch the tfl little bike do the route, have spent many happy minutes watching the little bike cycling thru london. Friends have him do 6 hour rides, it's been a competition.sad. Anyway don't believe the route get an a to z and find your own. All the above are good, i wouldn't do the 185 one although i do have to, on some of my journey ,cyclcling is great. When i started i was so thrilled i went back to my northern roots and was saying hello to everyone, to bemused smiles, anyway it wore off after a few weeks but getting into work even if you start off feeing shite you'll feel invigarted, but knackered.