Do you mean a profit of £200 per week (after paying out for expenses such as products, mileage, insurance, etc)? And is that before or after tax?
You could probably work out how many treatments you need to do per week to make the business viable by calculating your profit margin on each one (by deducting the amount spent on products from the amount you would charge for the treatment), then deduct a nominal amount for mileage at 40p per mile, based on the average distance you expect to travel to and from each client. Then work out how much recurring expenses such as insurance work out per day.
Also factor in the average time taken to do each treatment, so you will know how many treatments you can fit in per day, as well as travel time between clients, and definitely add some contingency time too in case a particular treatment overruns or you get stuck in traffic.
Also bear in mind that you won't be able to guarantee filling 100% of your time with bookings especially when just starting out - you will need time to build up a client base.
As for advertising - you will probably want to focus on your immediate area and perhaps a radius of say 5 miles or so - think of advertising in the local paper, or put up flyers in shop windows, or even a leaflet drop.
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