Big thanks to all replies so far. I seem to have solved those problems but I have found another. If you look at the video it looks like the couplers are moving but no filament is being fed through. I have placed a black dot on the filament and it's going nowhere. Any ideas ? I'll get there in the end haha. Thanks again
John
https://photos.app.goo.gl/tKDeAzp4uxvYM5e87