Repeal all laws pre 1954 or specifically pre the signing of the ECHR.
All legislation should be considered in light of the ECHR conventions however the convention rights did not exist pre 1954 (well maybe for a few months in 1953) and therefore those laws may not have had due consideration of those convention albeit the courts have considered various rights overtime.
Any laws, such as parts of the Offences Against The Persons Act 1861, can be reviewed and where appropriate updated while taking into proper consideration relevant stated cases and the convention rights.