D'oh...that is a Microplas Mk2 Mistral.
The car in that pic is an MGA built in 1956, first registered in Feb 1957 in Southend on Sea, UK. The car now has MGB running gear with overdrive box. The body shell is a rare Microplas Mistral built in the 1950's as a aftermarket racing car shell. This appeared in eBay in late September, 2005.