I would be surprised if anyone gives away actual earnings as it is very personal. Now, it depends really on who you work for. Naturally, self employed earn more but there are associated risks. I have employed friends who regularly earn a grand a week on domestic. To give you an idea, the company I work for pays £200 a kitchen with most being able to do 3 a week - not a bad wage. I also know of other people who only earn £8.57 per hour - about £350 a week.
So you see, it varies massively but remember - qualified rates are higher than that of an apprentice or mate.