Allan Conn - whilst there may still be Scottish £1 notes in circulation, they are not Legal Tender, although they are generally accepted by traders. In fact, Scotland has no Legal Tender, that being restricted to notes and coins issued by The BoE. (Rampant Scotland.com).

Teribus - there's no 'may have been the case' about it, it was the case when the Euro was initially adopted by 11 member-states on 1/1/99. So my point remains true - the UK wasn't 'allowed' by anyone to retain Sterling as its currency, it was its right to choose whether to keep Sterling or adopt the Euro. Fortunately, it chose Sterling.