Just seen a youtube video using these
http://growerssolution.com/page/GS/PROD/ZipUp
Anyone know if i can buy them in the uk?
good idea for a small Hoop House ;D
Not sure if it's the same but you can buy zippers by length in dunelm mills
Oops meant to add you could also try to use Velcro to attach them.
good point, strong double sided tape shoukld work on plasic tent zips as well.