Shade sail - great way to give shade. Can be taken down when it's not needed. Loads of colour choices.
Waterproof Woven Shade Sail Sun UV Protection Garden Yard Colors Sizes Shapes in Home & Garden,Yard, Garden & Outdoor Living,Garden Structures & Shade | eBay
A great guide to installing patio shade sails. It covers all the tips and tricks needed to get a sail flying!
Clara Shade Sail Pure White Waterproof Sun 98% UV Premium 3.6m Square Garden Canopy Awning Patio Outdoor Indoor DIY: Amazon.co.uk: Garden & Outdoors
Sliding Patio Cover for instant sun OR shade (This couple built a monstrous steel structure but these can be adapted to a small deck).
Best Waterproof Uv Protection Shade Sail Garden Yard Size 36*36 Rectangle Fabric Sun Shades Outdoor Sun Sail Multi Colors Options Under $90.81 | Dhgate.Com
Kookaburra 3.6m Square Yellow Waterproof Woven Shade Sail £59.99 …
Permanent Link to : Outdoor Shade Sails with Black Color to Protect from UV ray and Rain
Knitted sail shades are designed with small holes in the weave to allow hot air to escape and to keep it from getting too warm underneath the sail. However, if you want the extra reassurance in case of wet weather, a tighter weave is ideal. | eBay!
patio cover... wonder if you can get waterproof ones? Protection from the sun isn't a particular concern in Lancaster!