Not sure if any of this helps but it might contain some answers...

Although it might Not as it looks like much of it hasn't gone into force...

Maybe just old information...

Lots more of related info in Google might be worth Googling on...

UK/France Double Taxation Agreement – 2004...
UK/FRANCE DOUBLE TAXATION CONVENTION. SIGNED IN LONDON ON 28 JANUARY 2004 ... Article 20 (Government service). Article 21 (Teachers and researchers) ...
http://www.hmrc.gov.uk/international/france.pdf

Double Taxation Relief Manual: Contents...
DT7321, DT: France: double taxation agreement, Article 21: Students and business apprentices. DT7322, DT: France: double taxation agreement, Article 22: ...
http://www.hmrc.gov.uk/manuals/dtmanual/dt7250+.htm

UK-France Double Tax Treaty to be revised ... Please note that taxation is a complex subject and you should not take or refrain from taking any step without ...
http://www.sykesanderson.com/service...nce_latest.asp

Phil