The referendum was a democratic exercise and those we have elected to govern us must be bound by the result and take us out of the EU.

The protests in London, and elsewhere, are also a demonstration of people exercising their democratic right to protest.  These protests should not slow down the exit from Europe but those protestors have every right to express their view.

Referendum decisions are not set in stone, people change their minds over time - whether that time is 1 year, 10 years or 43 years depends on many factors - changes in the EU was one of the reasons given for the latest one to overturn the decision of that held in 1973 - no doubt the EU will change over the next 43 years - economic growth and other factors, (such as immigration), over the next 5 or 10 years may well improve so much that calls for a return to membership of the EU will dwindle, on the other hand if they don't there may well be demands for a new referendum.

Neither scenario is undemocratic - the only thing that would be undemocratic is if those that govern us don't follow the will of the people as expressed in the latest referendum.