Janstar, it might seem as though your childminder earns £14 an hour, but you need to remember she has to make an investment in cots, car seats ( parent's seats don't always fir the childminders car) highchairs, buggies, take off lighting and heating costs (I wouldn't have it on during the day, but I have to with a baby) wear and tear, extra cleaning, toilet roll. tissues, food, first aid equipment, public liability insurance, training costs, toys, pens paper, paints, puzzles, outings, etc, and then after all that is taken into account Tax and National Insurance have to be paid.
A childminder can only take 3 children under 5 including her own, so that is a maximum of £10.50 an hour, more likely she has one of her own, so therefore only £7 an hour less all those expenses.
A lot of childminders see it as a way to earn a bit of money while they bring up their own children, and there is nothing wrong in that, the downside is it can be rough on your own family, children having to share their toys, different sets of values etc, but it is a very rewarding job.
At the end of the day they certainly won't get rich on it!