From the website:
"The Minky 30m reel has 2 x 15m retractable lines coated with PVC for easy cleaning. It can be easily installed and dismounted, ideal for smaller gardens and patios."
- i bought one of these last year, and it's been excellent. I only have a very small yard, and this allows me to use all the available space for drying when I need to, but neatly stores away at other times. The next cheapest I can find is £8.16.
Don't forget Quidco!