The difference between Scottish currency and pound sterling

According to Baidu Encyclopedia, the pound is the British currency, which is issued and managed by the British government and circulated in the UK. The British government promises that the value of the pound in China is stable and can be exchanged between British banks and financial institutions. Scottish Pound is the currency issued by the Bank of Scotland and a kind of British currency, but it can only be circulated in Scotland, and British banks and financial institutions do not accept Scottish Pound. As the Scottish pound cannot circulate in Britain, its value may fluctuate and it is not as stable as the pound.