Don't forget that if you do manage to get work in an upmarket area you'll have to steal a vacuum from somewhere as these areas do have electricity and they often expect you to use appliances as part of the job. The customers don't even mind paying themselves for the electric so you don't even have to have your own electricity key. They must have money to burn.
Another tip is to park the hot wired Astra in a different street, that way if the police do find it while you are working you can deny all knowledge, always wear gloves when driving between jobs and drive as fast as possible to avoid being on the road as long.
Under no circumstances tell the DHSS that you have a sideline, they eventually will stop your Giro. If your signing on day clashes with a job still charge the customer full whack for the time you are away from the premises, it is not your fault you have to leave and the customer should expect this. If they do moan just send your mates around for a quiet word, and of course this is a chargeable extra for the inconvenience.
Good luck in your new venture, if you get a customer with a large plasma TV can you let me know.