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A mum fighting for legal access to medicinal cannabis in Northern Ireland will walk 150 miles to a hospital appointment with her son.

Charlotte Caldwell's son Billy suffers from intractable epilepsy which has left him with developmental delay.

Just one seizure could prove fatal and without the care he needed available in Northern Ireland, his mother took him to the US for treatment.

Today he has been 45 days free of seizures since starting specialist cannabis treatment that is banned in the UK.

Now Charlotte has been offered a meeting with Aidan Dawson, Interim Director of Specialist Hospitals & Women's Health at the Belfast Trust, on March 22 to discuss her son Billy's situation.

She wants other children to be offered the same option in the UK and says the meeting later this month is vital to push her message home.

So she will walk the 150 miles between her home and the hospital, setting out on Wednesday with the plan of turning up to the 2pm meeting eight days later.

And she hopes she will attract public support to her crowd funding campaign through her social media page .

Charlotte said: "This invitation to a meeting is a breakthrough in itself because the hospitals here in Northern Ireland had left Billy to die because they had no treatment for him.

"That was more than 10 years ago and I have taken him to America twice since then and he is still alive and at the moment he is thriving but he needs care here, not in the US.

"Today he is 45 days seizure free and the only medication he is taking is medicinal cannabis oil but we have had to source it ourselves with no help from the NHS.

"I plan to leave home with Billy on Wednesday and walk from Castlederg to Belfast and the Royal Victoria Hospital to meet with a clinician and Aidan Dawson who has responsibility for many things including the Royal Belfast Hospital Sick Children. I will walk every step and Billy will walk a bit and I will push his buggy the rest of the way.

"I want to urge him to push for a cannabis trial for kids in Northern Ireland who need it. That would mean the children who are doing without would get a chance and the data would actually be recorded and I believe it would show positive results for other children like Billy.

"So on March 15, 2017, Billy's Cannabus Walk will hopefully open the eyes of the officials and medical experts, and hopefully change his life and the life of others forever.

"I am inviting anyone who desperately needs CBD/THC therapy to come out and join us.

"On the way I will be reaching out to everyone to raise much needed funds so I can continue the life saving treatment for my son in LA until doctors here can over agree the treatment CBD/THC actually works and that Billy's life is worth protecting and saving."

Charlotte and Billy will leave Castlederg at 9am on and walk through Drumquin, Omagh, Gortaclare, Garvaghey, Ballygawley, Aughnacloy,Caledon, Armagh, Markethill, Newry, Loughrickland, Banbridge, Guildford, Portadown, Graigavon, Lurgan, Moira, Lisburn, Lambeg, Belfast and finally to the RVH.