A Bannockburn teenager - who is the only person in Scotland with a rare genetic disorder - has become a viral hit after receiving a special birthday message on TikTok.Calum McPherson, who is 15, lives with the CHAMP1 gene mutation which causes severe speech difficulties, with the teenager being non-verbal since birth and requiring specialist support through his life.Calum is one of around 109 kids around the world known to have the CHAMP1 mutation - there are no others in Scotland and eight in whole of the UK - most of whom have become connected through a Facebook group run by Stacey.As part of the celebrations ahead of his birthday on Sunday, Stacey asked STV news anchors John Mackay and Kelly-Ann Woodland if they would record a special
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