Ofsted did try to get things changed quite recently, but following discussion the decision was made to keep it as it is. It's a pain I feel, as for other businesses you can find where they are located.
Your local Children's Information Service may be able to help you cross match an identifier with a provider... but they may not, Data Protection Act may get in the way. Worth a try though.
it is for you to look as well but because we often work alone we are vulnerable. a nursery has an address but more often than not there is not a person living there
all childminders know there unique number and can give it out to you when you register your child I have had parent come round to register her child and leave paperwork on top of her car while she strapped her child in the car seat then drive off forgetting luckily a nearby worker found it and phoned me concerned that she had my name address phone number and personal details and I was glad she had found it not somebody else. She was by the local social services office when she found it and could potentially have caused all sorts of problems if they put our details on the web we could face this more often
Also the Ofsted website lists childminders in distance from the postcode entered - so if you already know their postcode, enter that... and the top entry is likely to be their inspection report (though there can be more than one childminder per postcode).
It's not the fault of Childminders that the Tax Credits system can be so easily abused. Given it is tax payers money they are spending, I feel they should be carrying out far more checks as to if a claim is legitimate. Are they not checking at all that the childcare being provided is actually being provided by the childcarer named on the form(s)?