DT7264 - Double Taxation Relief Manual: Guidance by country: France: Teachers and researchers
Article 20 of the agreement contains provisions in respect of visiting teachers and researchers.
If such individuals visit the United Kingdom or France for a period of less than two years, the host country will give a tax exemption but only where the teacher or researcher continues to be taxed by their “home” country, so the individual will always pay tax in one country or the other.

