The UK Constituent nations have their own concessionary bus passes that stop at the borders. Why?

People entitled to this concession are first and foremost citizens of the UK and should be entitled to travel anywhere within the UK, having all paid the same taxes in their lifetimes.

Reducing road transport and encouraging use of public transport are supported by the various governments in the UK for environmental reasons in particular. Enabling more public transport use would improve its viability in many areas and assist those worst off in economic terms during the cost of living crisis.

As more and more places introduce Low Emission Zones enabling a UK wide scheme will enable access to areas, nationally, that would otherwise be out of bounds to those who often have no wish or means to invest in a new car.

This change would be particularly beneficial for people who live near the borders of the different countries in the UK, there's no good reason why people living in these areas shouldn't be able to freely travel across the borders with the same bus pass - we're all part of the same country after all! This is the way rail passes have always worked, so there's no reason why the different Governments in the UK shouldn't be able to make this happen for buses too