What is the ECHR, and why does Farage want the UK to leave?

What is the ECHR, and why does Farage want the UK to leave?
On Tuesday morning Reform UK leader Nigel Farage delivered a speech in Oxford announcing that the UK would leave the European Convention on Human Rights (ECHR) if his party were in power.
Reform sees the convention as a barrier to its planned deportation of people who have entered Britain illegally and remain in the country at the expense of taxpayers.
But what might be the unintended consequences of such a move?
Report by Jonesia.
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