The Scottish Green Party [1] was a constituent part of the UK Green Party (as it was then called.) In 1996 the Scottish Green Party came to a UK Green Party annual Conference and declared independence. It is now an independent Green Party, and a fully independent member of the European Federation of Green Parties. After a while, the UK Green Party renamed itself the Green Party of England and Wales.
The Scottish Green Party benefits from the fact that the Labour Party Government created a Scottish Parliament, which includes an element of proportional representation in addition to the seats elected by first-past-the-post. In the first election to this parliament, in 1999, the Scottish Green Party managed to get one MP elected using the top-up proportional system. They expect to increase the number of MPs elected.