Good point from Prestine Clean, I had a similar one in Kensington and was ill advised, went in too high and lost it. Have a look at the agents and what they are offering, a lot of wealthy people uses agents to get all sort of work done. Don't take the job unless you are making reasonable profit it's not worth the hassle of london otherwise. Don't follow the cut throat brigrade and go in too cheap, make sure your insurance is sufficient in case of accidents.
But remember not all wealthy peeps like to pay, from experiece and not been over prejudice I find the none British the most likely cheap skates. But maybe it's just my run of fortune.