Cheap, easy and effective guttering to save rain from polytunnels

A plotholder has sent me the link to this video. It shows how to use cheap tile support edging to create a cheap, easy and effective rain-water guttering on polytunnels. This is at a fraction of the price of proprietory products sold for the purpose. You will have to be patient with the video but when he gets there it's worth waiting for.
Tile-edge rainwater guttering for polytunnels