I may be wrong, but if the goods are not leaving France I would say it's something wrong at the UK side and not the French side. I can't see why France would want to stop goods going to the UK, coming in is causing problems for some due to paperwork could they ask their shipping agent ?
As for getting British goods from the UK, we buy HP and Marmite here. Yes it's more expensive than in the UK but there is nothing else we want so it's not worth shipping in British food.
Having said that there is a company doing British food that deliver near Montmorillon Every 4 weeks to Civray, La Dorat, Bellac and Bussiere but I have not used them. https://www.thetradingpost.fr/
As for getting British goods from the UK, we buy HP and Marmite here. Yes it's more expensive than in the UK but there is nothing else we want so it's not worth shipping in British food.
Having said that there is a company doing British food that deliver near Montmorillon Every 4 weeks to Civray, La Dorat, Bellac and Bussiere but I have not used them. https://www.thetradingpost.fr/