Found this article whilst googling items on the wash.. pity the ffunding wasn't there!

From http://www.washestuary.org.uk/details.cfm?id=117


 1929-30: The Wash Speedway was the conception of the Automobile Racing Association to construct a racing track, motorboat waterway, aerodrome, golf course, sand yaching course, stands for the public, etc, etc - where speed trials could be undertaken. It would have been England’s answer to Daytona Beach in the USA. The construction would have been from Gibraltar Point to Clay Hole near the mouth of the Witham protected from the sea by a 20-feet bank. The track would have been made of a substance that would be of no harm to fish and water, and the parking facility for 50,000 vehicles!! The technical feasibility of it all was not the reason it did not occur but the question of compensating the frontagers and the local fishermen, and the general lack of money in the 1930s for such a costly scheme.

Parking for 50,000 in 1930.... wouldn't be many cars left on the road!