Moving from the UK to France (Pension and Investment Question)

I am 58 years old and moving from the UK to live permanently in France.

I am selling my residential property in the UK and have purchased a house in France.

I own a UK based software company which I will continue to work for remotely which pays me a salary and dividends.  This should continue for another 5 years at least.

I have investments and a private pension in the UK with Prudential.

I understand I will become tax resident in France.

Of course, want to minimise my tax bill and I have contracted a French based tax advisor to assess my situation and make recommendations.

They are pushing me towards an assurance vie.  However, I'm not keen to move my funds out of the UK as it will cost a lot to do so and the returns I get in the UK with Prudential are very good.

What have others done in this situation?