The ECHR is there to adjudicate matters arising within signatory nation courts with respect to compliance with the European Convention on Human Rights.
The UK is a signatory to the European Convention on Human Rights and played a leading role in its drafting and establishment.
These are matters for which the UK may be justly proud.
Please, I urge you, spend some time to read about the history of these institutions, how they operate and how UK law relates to the Convention.