The plan had been one packet, just to see what they looked like. Then it became two, so I could put together a five-a-side team. Then my friend Gavin, a Manchester United Women fan, sent over photos ...

Rachael Lloyd vividly remembers using her first sticker. She’d attached it to her dad’s work notebook. She was three. Her original sticker collection was lost in a move at age 11, but her passion for ...