Well I'd not heard of it until I went there, and registered (with permission!) using my husband's details. I can get information on the area where I live, but no actual credit details - you have to pay almost £10 for your credit file - details of which you can get for £2 from the credit reference agencies. The checkmyfile.com people send a "key" to you by snail mail for you to enter and check your file online.(posted 8418 days ago)Possible security problems here - I could have used my husband's name and his mother's address, but would their systems pick up that I'd used a different address, or would the key be sent to the address on the electoral roll, regardless of what address I'd registered with?
I could have also used someone else's name and my address to get access to their file, in theory - I'm not going to risk trying this!! The website say that they don't use your information, but I wouldn't trust them on this, but they do take a note of your IP address, so if you try registering again with different details, they will pick it up if they go looking.
I am going to bring the website to the attention of the data protection people and see what they say.