Brighton has two separate courier company's who deliver only by bicycle. There is also Brighton's cycling gardener and two cycling window cleaners operating in the City.
So it can be done.
I have been using a bicycle to get around my jobs for the last 3 weeks and once I get to my first job it has actually been quicker to get from job to job.
But your right about getting hot and sweaty.
Just what I have noticed, Taxi's shoot though it s if they own the road :censored: and why do they nearly always wait in the cycle box at traffic lights.