To my horror, my local place here inTours has stopped developing E6 and all other films. Outside of Tours, the nearest place is Paris, which is about 200 miles away

My problem is that I am in the UK only every 3 to 4 months. If I have film that has been exposed, what is the best way to keep it? I know that I could do this myself. However, I currently do not have the room where I live.
Thanks