Originally Posted by Goldorak

Be sure, when you enquire, that you precise that you will actually enter France because you will clear immigration. This is potentially completely different from a classical international transit when you're staying in the int'l transit zone and not entering the country you are transiting in.


Certainly not 5 or 6 times you will arrive in 2E, clear French immigration, collect your bags, clear customs (although you may not notice it unless you a stopped for a search). Then you arrive in the public zone (arrival area). You'll have to go one floor up (departure level), check-in to GLA (note that BE handled by AF in CDG), re-clear French immigration (you leave the Schengen area), pass security and finally take your flight
Of course you will have to clear UK Immgration arriving in GLA.