Coconuts and Oak Island (England Had Coconuts)

(Note that Coconuts do float on water, it is how the plant can be on multiple islands.)

https://www.youtube.com/watch?v=_FWG4n8ccJM

https://www.reference.com/science/coconut-seeds-disperse-35101c6594f1b945

Coconut seeds can float on water and can be carried by the Atlantic Gulf Stream to arrive at England's/Europe's Western shores. Granted your argument is just as sane as mine due to the Wikipedia page saying long journeys for seeds are not probable. See resources below: 

https://www.youtube.com/watch?v=GzRsyJSSWzg 

https://en.wikipedia.org/wiki/Coconut#Origin.2C_domestication.2C_and_dispersal

https://www.youtube.com/watch?v=_FWG4n8ccJM