Checkmyfile

Excellent site, very helpful and better than the competition

This company makes it very easy to see your credit score and reports across multiple providers (Equifax, Experian, Callcredit) and have a multitude of ways of helping you resolve any issues (including secure messages, free phone numbers and mobile friendly numbers to call)
Most providers offer a subscription service, I had been with Credit Expert (Experian) for some time but they had missed information that checkmyfile had from other providers so it makes sense to subscribe with a provider that gives you access to multiple credit reference companies.