Sorry,I didn’know you ratified the EU constitution. Also,I don’t have any English Euros,yet.
You can still be part of the EU without Euro’s. As we are. Our £ is simply stronger. Stronger than the Euro, stronger than the dollar.
As for the constitution; there are many documents that were previously signed that ratified the UK’s position inside the EU. The Lisbon Treaty (or the EU Constitution to the layman) was a stramlining on the rules and regs that already exist inside the EU.