Your challenge, if you choose to accept it, is to have Britain "take" France's place in the following ways in post-war Europe:
- Leaves integrated NATO command
- Prioritizes independent nuclear deterrent
- Integrates last colonial remnants as integral parts of UK a la French Guiana, New Caledonia, etc.
- Experiences a significant political reorganization similar in scope to the Fifth Republic
- Becomes a member of the Treaty of Rome's "Inner Six"
- Joins a Eurozone equivalent and remains in it today