UK Index Linked Savings

I would be grateful if anyone can advise me on the taxation in France of withdrawals from UK index linked savings.
The tax affairs of myself and my partner are very simple so I don’t need to get involved in some full financial review from an advisor. Can anyone point me to some online advice or should I just ask my local tax office?
Thanks in advance.

yes, that would be best or if you have an online account, ask the question there in the Messagerie Securisée after you log in at the the top of your your screen.