I think the reason that wouldn't work is because the purpose of the Euro was to supplant national currencies. Adopting the pound sterling across the
whole EU could show, in some eyes, favoritism toward the British. This could then spur some current eurozone nations to revive their currencies and
make new member states not want to adopt the pound. In short, the Euro is a neutral entity.
Another thing that I just though of, the treaty of Lisbon will most likely be ratified this fall. This treaty essentially makes the EU a country
[along the lines of the UK from what I've gathered]. In any event, this treaty acts as a European constitution and invests more power into the EU
parliament. The parliament could then just force Britain to use the Euro, as well as the rest of the EU, eventually.



