Murray Gray's mum is pushing for cannabis oil to be free on the NHS, as the family currently pay £1,000 a month for the treatment, which she says has seen her son seizure-free since 2019. The mum of a Scottish schoolboy who was having "hundreds" of seizures a day is set to petition the Scottish Government to change the law around medicinal cannabis oil, after not having a single seizure since he started using it.…