One that comes to mind recently is the Irish-sea border as part of Northern Ireland Protocol spanning from Brexit.

This was challenged as being in violation of the Acts of Union 1800 (particularly Article 6, which establishes an all-UK Customs Union) but the High Court ruled that the relevant parts of the Acts of Union are "impliedly repealed" by the Withdrawal Agreement Act.

There's a BBC article covering this here: https://www.bbc.com/news/uk-northern-ireland-57666255