Jarnel Singh has helped raise thousands of pounds for good causes over the years by organising events including a series of sponsored walks between Sheffield and Doncaster.
The pharmaceuticals delivery driver says it was the example set by the 'People's Princess' which provided the spur for his phenomenal charitable efforts with other volunteers from Sikh Youth Doncaster.
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"I was over the moon when I received the letter. I feel so honoured and privileged to have been invited," said Mr Singh, who will be accompanied on the big day by his wife Narmila.
The community stalwart spearheads Sikh Youth Doncaster, a group of volunteers whose fundraising exploits over the years have generated thousands of pounds to help victims of disasters ranging from last summer's Grenfell Tower inferno to the devastating Boxing Day tsunami in 2004.
"This invitation to the royal wedding isn't just for me. It's recognition of all 50 or so volunteers who've put in so much time and effort raising money for those who are most in need," he said.