Unlike most fans of the family, Tyler owns a framed brochure from Middleton's parent's business, a replica of Charles and Camilla's wedding certificate and a jar of dulce de leche, which she says contains a lock of Diana's hair – among more than 10,000 other pieces of Royal memorabilia in her home in northwest London.
"It's a mad house. I know," the avid collector, 66, tells The Telegraph. "Some people say I'm obsessed, to which I say, 'What about football fans?' "
Tyler, who describes Middleton as "a nice girl," adds, "The only downside is all the dusting."
Tyler's collection, now insured for about $64,000, began with a glass dish adorned with a picture of the Queen's head that she bought 32 years ago. Her stash of tea towels, tankards and trinkets continued to grow through the Diana and Charles era – she even has a "Diana room" in her house with a painting of the late princess on the ceiling.
So what are her plans for the big day? Tyler, who is "over the moon" over the engagement, says she won't miss out on the Westminster Abbey action.
"I hope to be as near to the Abbey as possible," she says. "I'm getting a bit old for camping, but I suppose I'll have to."