Everyon, including The Guardian, has the story of the soon-to-be-authenticated Turner:

Experts will present evidence next week claiming to have uncovered a long-lost painting by JMW Turner, bought for £3,700 but now valued by one insurance firm at £20m.

Jonathan Weal, 54, who works for an art investment fund, spotted the seascape eight years ago in an auction at a Kent golf club.

After years of research, his belief in the work – entitled Fishing Boats in a Stiff Breeze – has apparently been backed by art experts and by scientific tests that investigated everything from pigments to the signature.

Missing Turner Painting to be Unveiled (The Guardian)