What began as a family beachcombing hobby turned into a global mission to track down Lego lost at sea, and raise awareness about plastic pollution.
Tracey Williams was on holiday with her children in Bigbury Bay in south Devon in 1997 when they found their first "tiny treasure" - a piece of Lego washed ashore from a container lost from a cargo ship hit by a rogue wave off Cornwall.
Since then she said people have flown in from the US, Italy, Switzerland, and Belgium just to hunt for the pieces on Cornish beaches.
Mrs Williams said: "I've done interviews with Italian bloggers, American journalists; it's amazing how much interest there is."
As well as travelling over to search finds have been reported across the world including in the US and Australia.
