But Mrs Caldwell claimed he is still unable to get the type of drug he needs on prescription, as doctors say there is a lack of clinical evidence of its effectiveness and safety.
She said: “I think the conference will create more awareness and hopefully more medical professionals will… start to be educated about medical cannabis products.”
The UK is the world’s biggest medical cannabis producer, according to a UN report last year.
The Women, CBD Medical Cannabis Conference takes place at the Hilton London Paddington. Marc Davis, of organisers Capital Markets Media, said: “There is still a long way for the UK medical cannabis market to go before it becomes widely accessible and acceptable.”