Sorry to shatter the illusion but a huge amount of the UKs laws and regulations have their foundations in EU law and therefore un-codified in UK legislation.

As we leave the EU, we will be bringing these laws with us, nothing will change. In fact, the ECHR signing is not even dependant on the UK being in the EU, nor is the statute that allows the ECHR to be enforceable in UK courts. The statute integrating the ECHR into the UK legal system is actually a piece of British legislation called the Human Rights Act 1998.

I know what I'm talking about, don't worry