I've spent an absolute age trying to untangle this, but I just cannot get it to fold back over in the guide again as there clearly isn't enough room to fold it back over in the very limited gap.

Anyone know if there's a quick and easy fix for this as it's driving me insane...apart from buying a whole new belt assembly?

Try harder  

 

Seriously though, it got tangled because it got forced through the gap while folded, so it must go back again. They always do, just needs a lot of brute force and swearing. 

 

If you fold the strap at an angle it helps, as does adding some non-destructive lubrication. Furniture polish is good for this, it doesn't stain, but makes it slippier/shinier which helps a little. The fold will need to be really tight, so you may need to encourage it with a butter knife or something.

https://youtu.be/IpZqRgML1w8

Tar lads.

I'll try again when missy brings it home.