Hi,
As a resident of the UK, you are taxed on your worldwide income and gains. This includes interest from accounts overseas, no matter whether they are not subject to tax in that country. Article 12(1) of the UK / France double taxation agreement, advises that interest arising in France and beneficially owned by a resident of the UK, shall be taxable only in the UK. You can see the information here:
UK/FRANCE - DOUBLE TAXATION CONVENTION
Thank you.