This particular agreement is a bi-lateral agreement, separate from the EU.
I'm sure that a good, ongoing relationship with France has enabled this agreement to be in place, it doesn't necessarily follow that the agreement will be torn up if the UK eventually leaves the EU, though as you say...
Awful, awful news.
Jo Cox was a mother, a wife, a daughter, a campaigner, an MP and - by all accounts - a lovely, compassionate, caring person, popular across the political divide.
Our condolences go out to her family and friends.
Speculation is meaningless and inappropriate. Please cease and...