I had a lot of trouble when it came to exporting things, i think the file size of the videos are so big they're taking up the majority of space on my laptop, i have a feeling its something in the in camera settings that I've done wrong because i don't know what else would cause it. I have been going through my computer for hours deleting / moving files onto an external hard drive and I've managed to save some room.
A big problem which i was having was exporting the whole movie in after effects, i had to do this to get the colour overlay. The first time i tried to do this the file was 50GB - hense why there was so storage space left but after going through the settings i managed to render the movie and save a lot more space though i think the quality may have suffered a little.
this is a screen shot after deleting and moving files.

