I understand that you have lived in France Joseann, so you will know that people do move here, then back to the UK, which is one good reason for staying in touch. I know about my former MP because he is high profile and actually one of the good ones. I shan't vote for him, because I am a lifelong member of the Labour Party and have paid my dues all the time we have lived in France. I talk about life here and in the UK to family and friends throughout Britain, watch TV, read, newspapers and (in normal times) visit often. What is it that I can't know?
I pay tax in the UK and whilst I understand the vagaries of the exchange rate, I think an overall decline of 12% since Brexit, is a bit more than a vagary. We have the spreadsheets recording our income.
Before anyone tells me to get involved in the country I live in - I was an elected local councillor in my village until Brexit took away my right to stand for election.
These countries, among many others allow citizens abroad to vote.
France, , Germany, Spain, Denmark, Netherlands, Norway, Switzerland, the United States.
Why should the UK be different?