from the treaty of union of 1707 - until 1999 - a unified parliament of great britain (since january, 1801, known as the parliament of the united kingdom), at westminster, was responsible for passing legislation affecting private law both north and south of the scottish border. in 1999, the devolved scottish parliament was established, and private law measures can now be passed at holyrood, the seat of the scottish parliament in edinburgh.