Searing pain ripples down the back of Matt Grant's legs to his feet. It feels like a scalpel slicing through his flesh with no anaesthetic.

Five weighty metal screws threaded like lattice work through his spine fuse it together in three places.

To ease the intense pain the 48-year-old takes a concoction of pills that are slowly eating away at his insides, with ulcers forming on his throat, his stomach lining becoming irritable and he regularly spits up blood.

Read more:Two-thirds of GPs quizzed about medicinal cannabis

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Sitting for longer than five minutes becomes excruciatingly painful so he

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