Both Political Parties claim it prevents governments from deporting illegal immigrants.
According to the Oxford University report, since 1980, the European Court of Human Rights has found against the UK in 13 removal (deportation) cases.
Of those 13, 4 concerned family life. The Government won in 26 cases.
In 45 years only 39 cases have been brought to the ECHR.
Doesn’t sound as if leaving the ECHR is about immigration.