I love cycling in London, and it would be nice to do it for a living. But as I quite like going slowly, stopping to take a picture of something every five minutes, and investigating any alley which has a pub with hanging baskets, I'm not cut out to be a courier. And being allergic to offices, piloting a sandwich bike-trailer is probably out too.
This looks more like it: pedalling a recumbent-based advertising hoarding round the centre, like this one I snapped on Fleet St the other day.
Going slowly, especially where large groups of people are gathered such on the pavement outside pubs, is actually an advantage.