The 'better climes' expression is metaphorical and not necessarily about the weather.
The mention of Brexit is not political at all- but expresses the fact that post Jan 2021- moving to an EU country for UK people, especially retirees, has become hugely more complicated. Permits, minimum income and opening bank account and keeping UK ones, driving licence, health care and so much more, including very poor exchange rates for Sterling. This is NOT 'political', just plain fact.
Since then, CountessFosco has mentionned the fact her OH has an EU passport, which changes a lot, but not all. UK resisdents abroad have had their UK bank accounts closed, driving licences still have to be exchanged in some countries, and re-taken from scratch in others, and Sterling is still much lower than it used to be. All those facts have to be taken into account, as well as the cost of move, and the emotional side too.
Moving back is hard enough, without having to face the huge issues the UK is facing today, including a crumbling NHS- hence my real sympathy and empathy for CountessF.