As you may have read in the news, http://news.bbc.co.uk/1/hi/uk/8277378.stm reciprocal childcare agreements between friends could be illegal if the friends don't register with Ofsted. If you don't agree with this you may wish to sign a petition requesting that the government change the law:
petitions.number10.gov.uk/reciprocalcc/?signed=f24d718.297571