Hi,
On the tax question as DejW says you'll only pay tax once as the UK and France have a tax treaty and if you're registered for tax in France then you may have to complete a UK tax return, but it would confirm the zero tax payable in UK
Regarding the question about investment advice, as Hils said it depends on what questions you're wanting to ask and about what investments. When you say "property advice" do you mean advice on how to buy something including what mortgage, and maybe the insurances etc, or is it more someone to advise you on what is your tax situation and how does property ownership affect that? ... or perhaps views on where to buy a property for an investment ... and as a 'buy-to-let' rather than somewhere to live in?
And when you say "investment" are you still talking about property or are you also interested in stocks, bonds, funds etc?
Best, Rick