Roy Scott, 42, has been asking the government and medical officials for years to be given cannabis oil to ease violent seizures he suffers as a result of an accident which caused him spinal injuries.

Mr Scott said some of the seizures can be so severe that he is thrown out of his chair.

New guidelines have now been introduced so cannabis products can be legally prescribed in the UK for the first time.

They can be prescribed by specialist doctors in a limited number of circumstances, however some charities fear the new rules will be much more limited that first expected.

That is Mr Scott’s view, who says he won’t qualify for the prescription of Sativex, a cannabis extract.

He has now written to North Shropshire MP Owen Paterson, who had helped Mr Scott, and pushed for medical cannabis to be legalised.

He said in the letter: “I must convey my disappointment.

“Far from the assurance the home secretary gave you in a letter that you replied to where he said ‘Sativex would be able to be prescribed by a GP, ‘these goal posts’ have been moved very far.

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“Under these new guidelines, as a spinal injury, I will not qualify for a prescription for Sativex, and neither will anyone suffering from Parkinson’s disease, chronic pain or cerebral palsy.

"This is not what the home secretary promised the country’s sick and poorly, who would have benefited from medical cannabis. As I have always stated in my previous letters, I am not calling for cannabis to be legal for any other purpose than for medical use.

“However, given the extremely limited scope the home secretary has issued for prescribing medical cannabis, and the hostility towards medical cannabis by my consultants, I feel cheated and betrayed.”

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Mr Scott said he may have to look at other 'street' options.

He added: "Given that the last time I tried to obtain medical cannabis via the Netherlands ended with its seizure by HM Border force, it is my belief that I now have no choice by to do the unpalatable.

"I must now resort to buying ‘street cannabis‘ with all of the risks that will entail, for example, lack of a quality control, the risk of contaminated cannabis, the risk of no clinical oversight and possibly the risk of cannabis psychosis."