Tech 21 iPhone 6/6s Plus Mesh Case - £3.99 (Argos Via Ebay)
I had a regular 6s case from these guys - this exact one but smaller and it faired so much better than the official apple one did on my 6
Tech21's Evo Mesh Case powerfully safeguards your phone with intelligent impact protection. That means impact force is absorbed and repelled away from your phone thanks to scientifically proven, hybrid impact-protection FlexShock material that is injection moulded into the Energy Absorbing System. Ultra-thin and extremely lightweight, Evo Mesh offers tough protection.